A cell phone store sells the basic model of a phone for $30 and the upgraded model for $100 when a customer signs a two-year agreement. On Tuesday, the store has $900 in sales. The store pays $5 for each basic model and $25 for each upgraded model. If the cost of the cell phones sold on Tuesday is $200, how many upgraded models were sold?

Question

Brody Lam

Mathematics

9 November, 01:16

A cell phone store sells the basic model of a phone for $30 and the upgraded model for $100 when a customer signs a two-year agreement. On Tuesday, the store has $900 in sales. The store pays $5 for each basic model and $25 for each upgraded model. If the cost of the cell phones sold on Tuesday is $200, how many upgraded models were sold?

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Lena Wagner · Answer 1

You need to set up 2 equations for this, a system to be exact let x represent the cheaper phone and y represent the upgraded phone for store costs you will have 5x+25y=200 for selling prices you will have 30x+100y=900 set these two equations together 5x+25y=200 30x+100y=900 multiply the first one by - 4 and add them - 20x-100y=-800 30x+100y=900 10x=100 x=10 10 cheaper phones, plug into any equation again 5 (10) + 25 (y) = 200 y=6<<<6 upgraded phones