Answer:
0.25M + 0.75B + 1.25C - 50 = total money raised
Explanation:
0.25 for each muffin so if 78 are sold we do 78*0.25 = 19.5
0.75*56 = 42 for brownies
1.25*30 = 37.5
19.5+42+37.5 = 99
99 -50 = 49
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