Respuesta :

reinhard10158

Step-by-step explanation:

100% = $5

10% = 100%/10 = 5/10 = $0.50

40% = 10% × 4 = 0.5×4 = $2

so, to make 40%profit, he needs to sell the 20 drinks for 5+2 = $7 in total.

one drink should be sold for 7/20 = $0.35

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