Question

Freda bought a sandwich for $4.00 and a drink for94$.Her grandson ordered a meal for$6.35.What was the total price of all three items when 8% sales tax was added?Explain how touse estimation to check whether your answer is reasonable

Answer 1

Answer:

Total price = $112.70

Step-by-step explanation:

Total price of all three items without tax = 4 + 94 + 6.35

= $104.35

Total price of all three items with tax = (100% + tax) * Price

= (100% + 8%) * 104.35 = 108% * 104.35

= 1.08 * 104.35 = 112.698

≅ $112.70

(2) Explain how to use estimation to check whether your answer is reasonable:

We can use estimation to check if a result is reasonable by plugging in the answer in the original equation.

E.g. x + 4 = 10; x = 10 - 4

We get that x = 6

Plug in x = 6 in x + 4 = 10.

6 + 4 = 10. Indeed the answer was a reasonable one.