Question

Please help me with these questions 19pts

Answer 1

Answer:

a)

$p(r)=(r-5)\cdot 1.05$

b)

$p(15.50)=(15.50-5)\cdot1.05=10.50\cdot1.05=11.025\approx11.03$

Step-by-step explanation:

a)

Assume that r is a regular price before discount and tax

Including discount, we substract 5 from r. We get (r-5).

Then, we include tax by adding 5% value of (r-5)

Including a tax we may realize by multiplying initial value (r-5) by 1.05, where an ending .05 is percentage value of a tax

b)

in a formula $p(r)=(r-5)\cdot 1.05$ we substitute r=15.50  and calculate the value on the right side of the sign "=".

You solve it too, using a calculator.

If you push the following buttons:

1 5 . 5 0 - 5 = + 5 %

you should get a result 11.025, after approximation to the 2 digits after comma there is 11.03