Question

Jessica is shopping for a sweater the one she wants is 30%off she estimated the sale price by multiplying the original price by 0.7 why will it work

Answer 1

Multiplying 0.7 by the original price will work...

If you divide the cost by 100, subtract 30 from 100, you will be left with 70% times the 1/100
70% is also expressed as 0.7, since 7/10=70/100

Hope this helps!