On Monday, Archie paid $3.40 for 3 donuts and 2 coffees. On Tuesday he paid $3.60 for 2 donuts and 3 coffees. On Wednesday he bought 1 donut and 1 coffee.  What was his bill.      

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(3d+2c= 3.40)-2(2d+3c=3.60)3-6d-4c=-6.806d+9c=10.805c=4c=$.803d+2(.80)=3.403d=1.8d=$.601d+1c= bill1(.60)+1(.80)=bill$1.40= bill