Astore sells the basic model of a phone for $60 and the upgraded model for $200. it costs the store $10 to buy each basic model and $50 to buy each upgraded model from the phone company. on tuesday, the store has $1,800 in sales for these two models, and it paid the phone company $400 to buy these phones. how many upgraded models did the store sell on tuesday? 6 upgraded phones 10 upgraded phones 15 upgraded phones 42 upgraded phones

6 upgraded phones were sold on Tuesday.

Step-by-step explanation:

Let the number of basic model of phones be = x

Let the number of upgraded models be = y

As per the given situation, we get 2 equations:

Equations form:

        ......(1)

            .......(2)

Multiplying (2) by 6 and subtracting (1) from (2), we get;

y = 6

And

=>

=>

=>

x = 10

Hence, 10 basic models and 6 upgraded models are sold on Tuesday.

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step-by-step explanation:

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