If the cost of a pen is 8.50 and the cost of a pencil is 5.50, the total cost of 20 pens and 16 pencils is

Correct option is A

Given
Cost of 1 pen = 8.50
Cost of 1 pencil = 5.50
Number of pens = 20
Number of pencils = 16

Formula Used
Total Cost = (Cost of 1 pen × Number of pens) + (Cost of 1 pencil × Number of pencils)

Solution
Total cost of 20 pens = 20 × 8.50 = 170

Total cost of 16 pencils = 16 × 5.50 = 88

Total overall cost = 170 + 88 = 258

So the correct answer is (a)