The original price of a storage bin is $20 and the tag says 20% off the original price. What is the sale price?

20% of $20 is $4. Therefore, the sale price is $20 - $4 = $<<20-4=16>>16. Answer: \boxed{16}.

Cara buys a picnic table during the sale. If the original price was $40, and the tag says 30% off the original price. how much does Cara pay?

30% of $40 is $12. Therefore, Cara pays $40 - $12 = $<<40-12=28>>28. Answer: \boxed{28}.

To find the sale price, we need to calculate 20% of the original price and subtract it from the original price.

Step 1: Calculate 20% of the original price.
To calculate 20% of a number, we multiply the number by 0.2.

20% of $20 = $20 * 0.2 = $4

Step 2: Subtract 20% of the original price from the original price.
The sale price is the original price minus the discount.

Sale price = Original price - Discount
Sale price = $20 - $4 = $16

Therefore, the sale price of the storage bin is $16.