Part of your job as an air pollution control engineer is to

Part of your job as an air pollution control engineer is to periodically test for acid rain. You need a supply of pH strips for the study you are conducting this month. You go through about 150 pH strips per week. A box of 100 pH strips costs $15. A box of 200 pH strips costs $25. Which is the better deal, and how much will a 4-week supply cost? A. Box of 100, $45 B. Box of 100, $60 C. Box of 200, $75 D. Box of 100, $90 E. Box of 200, $100

Solution

Since requirement of strips for a week = 150 pH

So, requirement of strips for 4 weeks = 4 * 150 = 600

Now, cost of 600 strips for 100 per box = 6 * $ 15 = $ 90

Cost of 600 strips for 200 per box = 3 *$ 25 = $ 75

Since cost of 600 strips is less for 200 per box than 100 per box.

Hence, best deal is to purchase 3 boxes of box of 200 with cost $ 75.