Sales Tax
100

This is the amount added on after the original cost is multiplied by the percent added on 

what is tax

200

this is portion multiplied by the cost of the product not including tax

what is the percent

300


this is the amount added to the percentage

what is the cost not including tax

400

bob is buying a 12 pack of mountain dew and there is 25% tax the amount he payed is the 

total cost of the product

500

the way you get the total cost including tax is the also the way of repeating a number to get a bigger number by time-sing it  1 or more times

what is multiplication