Martha has $20 to spend on a t-shirt. She has a coupon for 20% off. The t-shirt regularly sells for $22.50 plus 10% sales tax.
Choose all that correctly compute the cost of the t-shirt.
Responses
A Martha takes 80% of the regular purchase price of $22.50, and then computes 110% of the reduced price.Martha takes 80% of the regular purchase price of $22.50, and then computes 110% of the reduced price.
B Martha takes 20% of $22.50 and subtracts that amount from the regular price. She finds10% of the discounted selling price and subtracts it to find the purchase amount.Martha takes 20% of $22.50 and subtracts that amount from the regular price. She finds10% of the discounted selling price and subtracts it to find the purchase amount.
C Martha takes the difference between the 20% discount and the 10% sales tax, then multiplies that by the regular price.Martha takes the difference between the 20% discount and the 10% sales tax, then multiplies that by the regular price.
D Martha takes 20% of $22.50 and subtracts that amount from the regular price. She finds 10% of the discounted selling price and adds it back to find the purchase amount.Martha takes 20% of $22.50 and subtracts that amount from the regular price. She finds 10% of the discounted selling price and adds it back to find the purchase amount.
E Martha finds 10% of the regular price and adds it to the regular price, then finds 20% of this sum and subtracts this amount from that sum.
B Martha takes 20% of $22.50 and subtracts that amount from the regular price. She finds 10% of the discounted selling price and subtracts it to find the purchase amount.
The correct choices for computing the cost of the t-shirt are:
B) Martha takes 20% of $22.50 and subtracts that amount from the regular price. She finds 10% of the discounted selling price and subtracts it to find the purchase amount.
D) Martha takes 20% of $22.50 and subtracts that amount from the regular price. She finds 10% of the discounted selling price and adds it back to find the purchase amount.
To compute the cost of the t-shirt with the discount and sales tax correctly, we need to follow these steps:
1. Calculate the discounted price of the t-shirt: Martha takes 20% of $22.50 and subtracts that amount from the regular price.
Equation: $22.50 - (20% of $22.50)
2. Calculate the sales tax amount: Find 10% of the discounted selling price.
Equation: 10% of discounted price
3. Subtract the sales tax amount from the discounted price to get the final purchase amount.
Equation: discounted price - sales tax amount
Now, let's go through each option and see which one correctly computes the cost of the t-shirt.
A. Martha takes 80% of the regular purchase price of $22.50, and then computes 110% of the reduced price.
This option is incorrect because it does not account for the 20% discount and 10% sales tax separately.
B. Martha takes 20% of $22.50 and subtracts that amount from the regular price. She finds 10% of the discounted selling price and subtracts it to find the purchase amount.
This option is correct because it follows the steps mentioned above.
C. Martha takes the difference between the 20% discount and the 10% sales tax, then multiplies that by the regular price.
This option is incorrect because it does not correctly compute the discounted price and the sales tax separately.
D. Martha takes 20% of $22.50 and subtracts that amount from the regular price. She finds 10% of the discounted selling price and adds it back to find the purchase amount.
This option is incorrect because it adds the sales tax amount instead of subtracting it.
E. Martha finds 10% of the regular price and adds it to the regular price, then finds 20% of this sum and subtracts this amount from that sum.
This option is incorrect because it does not correctly compute the discounted price and the sales tax separately.
Therefore, the correct option is B. Martha takes 20% of $22.50 and subtracts that amount from the regular price. She finds 10% of the discounted selling price and subtracts it to find the purchase amount.