The multiplier for decreasing by 45% is 0.55
So you times the multiplier by the price to get your answer:
650 x 0.55 = $357.50
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4:1/6 if you add all the instruments you get 120 then you divide it by six and you get 20 snare drums
So you are given the amount he sold which is $7300, and you are given his commission rate so all you have to do is this
7300 x 0.12 = 876
Therefore, his amount of commission is 876 dollars
