You have a coupon good for $5 off the price of any large pizza. You also get a 15% discount on any pizza if you show your student ID. How much more would you pay for a large pizza if the cashier applies the coupon first?
$.75
$0.00
$.05
$1.05

Question

You have a coupon good for $5 off the price of any large pizza.  You also get a 15% discount on any pizza if you show your student ID.  How much more would you pay for a large pizza if the cashier applies the coupon first?  
$.75
$0.00
$.05
$1.05

tester97 · Answer

@wolfe8 can you help me?

wolfe8 · Answer

So you're comparing if you use the coupon first to if you use your ID first.
Let x be the original price

So coupon first: 
x-5
then discount of 15% making you pay 75%
(75/100)*(x-5)

ID first:
(75/100)*x
then coupon
(75/100)*x -5

Find the difference.

tester97 · Answer

this looks like the same exact thing. for both the ID first and the Coupon first. so im confussed,

wolfe8 · Answer

Notice the brackets :)

wolfe8 · Answer

For the coupon it can be written as:
75x/100 - 5

tester97 · Answer

so i do (75/100)*x then (75/100)*x-5 and subtract the two?

wolfe8 · Answer

No you do what I wrote O.o

tester97 · Answer

ok let me try.......btw i really suck at this :\

wolfe8 · Answer

It's ok. Start by opening up the brackets

tester97 · Answer

wait so would the answer be  a 75 cents difference?

wolfe8 · Answer

If you did the calculations right, yep. But I can't check cuz I haven't done it myself

tester97 · Answer

oh ok  but im not sure if i did the calculations correct hopefully i did thanks wolfe :)

wolfe8 · Answer

Can you show me what you did?