Question

Calculate the average price paid per kilogram of sodium hydroxide in a lab storeroom consisting

of 40 kilograms bought for R15 each; 10 kilograms bought for R20 each; 5 kilograms bought for

R40 each; and 50 kilograms bought for R10 each.

Answer 1

$\text {Average cost} = \cfrac{\text{Total cost}}{\text{Total weight}}=\\ = \cfrac{40\cdot15+10\cdot20+5\cdot40+50\cdot10}{40+10+5+50}=\\ =\cfrac{1500}{105}=14.29.$