15. what is the difference in unit price? old size: 7 oz price: $0.89 new size: 5 oz price: $0.89
15. what is the difference in unit price? old size: 7 oz price: $0.89 new size: 5 oz price: $0.89
Answer
Explanation:
Step1: Calculate old - unit price
The old - unit price is calculated by dividing the old price by the old size. The old price is $0.89 and the old size is 7 oz. So the old - unit price $u_1=\frac{0.89}{7}\approx0.1271$ dollars per oz.
Step2: Calculate new - unit price
The new - unit price is calculated by dividing the new price by the new size. The new price is $0.89 and the new size is 5 oz. So the new - unit price $u_2 = \frac{0.89}{5}=0.178$ dollars per oz.
Step3: Calculate the difference in unit price
The difference in unit price $\Delta u=u_2 - u_1$. Substitute $u_1\approx0.1271$ and $u_2 = 0.178$ into the formula: $\Delta u=0.178 - 0.1271 = 0.0509\approx0.051$ dollars per oz.
Answer:
$0.051$ dollars per oz