Question

The price of an answering machine is reduced 15%. The sales tax is 8%. Is the final cost equal to the original price less than 7%? Explain.

Answer 1

The price of an answering machine is reduced 15%. The sales tax is 8%.
This is saying:\[
C = P_{old}\times (1-0.15)\times(1+0.08)
\] Is the final cost equal to the original price less than 7%?
This is asking: \[
C = P_{old}\times (1-0.07)
\]