Last year you purchased 20 shirts at $15 apiece, 30 CDs at $12 each, and 5 sweaters at $25 apiece. This year you buy 20 shirts at $20 apiece, 30 CDs at $12 apiece, and 5 sweaters at $20 apiece. If last year's index was 100, this year's index is

Question

Quizplus · Accepted Answer

First, we need to calculate the total cost of the items last year and this year:

Last year: 
- 20 shirts at $15 apiece = $300 
- 30 CDs at $12 apiece = $360 
- 5 sweaters at $25 apiece = $125 
Total = $785

This year: 
- 20 shirts at $20 apiece = $400 
- 30 CDs at $12 apiece = $360 
- 5 sweaters at $20 apiece = $100 
Total = $860

Next, we can use the cost of the items from last year as a base and calculate the index for this year:

Index = (Total cost this year / Total cost last year) x 100 
Index = ($860 / $785) x 100 
Index = 1.095 x 100 
Index = 109.5

Therefore, the answer is C.

Last Year You Purchased 20 Shirts at $15 Apiece, 30