Question

Carlos is saving up to buy two new books. He has saved 60% of one book that costs 18$, and 30% of the cost of another book that costs 21$. How much more does he need to save?

Answer 1

The answer to your question is: $61

Explanation:

Data

Book 1 = 60% that costs $18

Book 2 = 30% that costs $21

Process

Book 1

60% ----------------- $18

100 % ---------------- x

x = (100x 18)/60 = $30 actual cost

He needs to save 30 -18 = $12

Book 2

30% ------------------ $21

100% ----------------- x

x = (100 x 21) / 30 = $70 is the actual cost

He needs to save 70 - 21 = $49

Total

$49 + $12 = $61 needs to save to buy two books