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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.

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    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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