At the city newsstand, Sunday papers are 10% off after 5:00 PM. Mr. Johnson pays $3.60 for a paper after 5:00 PM. He wants to know the regular price.

The regular price is $4 i. e., $3.6 divided by 0.9 = $4

Step-by-step explanation:

you know that the sales price is $3.60 and the discount is 10% so ...

? out of 100% which is the regular price

$3.60 out of 905 which is the sales price

3.6 = 0.9r

3.6 divided by 0.9 = 0.9r divided by 0.9

= 4

this means that the discount is $0.40

the regular price of the paper is $4.