What is the discount on video game marked at 30% off the regular price of $45?

Discount is 30%

find 30% of 45

percent means parts out of 100
30%=30/100=0.30

'of' means multiply

30% of $45 means
0.30 times $45=$13.50

the discount is $13.50
the amount you would need to pay is $31.50