Monica paid sales tax of $1.80 when she bought a new bike helmet. If the sales tax rate was 9%, how much did the store charge for the bike helmet before tax?

Answer 1

0.09x = 1.80

Solve for x.

Answer 2

Let the charge of helmet befor tax be x

so
9% of x= 1.80

9x/100 = 1.80

x =(1.80*100)/9

= 20