Posted by **Tom** on Sunday, May 12, 2013 at 6:26pm.

Stacey used her 20% discount card to buy 7 cans of tomatoes and 15 cans of mushrooms for $10.64. The next day Brian spent $ 7.21 on 17 cans of tomatoes and 5 cans of mushrooms in a "30% off" sale. Find the undiscounted pre- sale price of each type of can.

- math -
**math lover**, Sunday, May 12, 2013 at 9:55pm
let's use T for tomato and M for mushroom,Stacey:$10.64 is 80% of the original price of 7T and 15M so 20% discount will equal to 2.66 and the original price will be 13.3.

Brian:7.21 is 70% of the original price of 17T and 5M so 30% will equal to 3.09 and the original price will be 10.3.

Stacey:7T+15M=13.3

Brian:17T+5M=10.3

now multiply Brian by 5 will get

7T+15M=13.3

51T+15M=30.9

now subtract it will get

44T=17.6 and T=$.40 and M=$.70

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