18. A pet doctor earns $82,000 per year. A pet
doctor’s assistant earns $22,000 per year. Suppose
both a pet doctor and her assistant work for 10
years. How much more than her assistant does the
pet doctor earn ?
A $600 B $6000
C $60,000 D $600,000
19. Lacey is attending a university where
the cost for one year is $10,500. She has
a scholarship worth $6,000 and a grant
worth $900. She earns $45 a day at her job.
How many days does she need to work to
pay for 50% of the remaining amount?
A 40 C 60
B 50 D 80
The correct answer to 18 is C) $60,000.
To find out, we need to calculate the difference between the pet doctor's and her assistant's earnings over the course of 10 years:
Pet doctor: $82,000 x 10 years = $820,000
Assistant: $22,000 x 10 years = $220,000
Difference: $820,000 - $220,000 = $600,000
Therefore, the pet doctor earns $600,000 more than her assistant over the course of 10 years.
For question 19, we need to first calculate how much Lacey would need to pay for 50% of the remaining cost after her scholarship and grant are applied:
Total cost: $10,500
Scholarship: -$6,000
Grant: -$900
Remaining cost: $10,500 - $6,000 - $900 = $3,600
To pay for 50% of $3,600, Lacey would need to earn:
50% of $3,600 = $1,800
To earn $1,800, she would need to work:
$1,800 ÷ $45/day = 40 days
Therefore, Lacey would need to work 40 days to pay for 50% of the remaining cost after her scholarship and grant are applied.
The answer is A) 40.