Paul has a coupon for $2.50 off a box of name brand cereal that normally costs $12.78 the store brand cereal costs $10.98 how much will paul save if he uses his coupon and buys the name brand cereal instead of the store brand cerial

The given facts here would be :
 
1.Name brand cereal: $12.78 and Store brand cereal: $10.98.
2. Coupon for $2.50 off on the name brand.

What the question is asking is how much would he save if he used the coupon. So you would need to know how much it will be after the coupon is used. Here is the following steps to this question:

Step1 find out the price after coupon:

Regular price 12.78－Coupon worth 2.50 = 10.28
Now after knowing the price after coupon we need to find how much she saved

Step2 finding how much Pual saved after using to coupon and buy the named brand

Store brand price 10.98 －The price after discount 10.28 = $0.70

So Pual saved $0.70 by using the coupon and buying the named brand cereal.

Hope it helps!

The answer would be 24mm