Homework

The monthly fee for the phone is 12 USD and for phone unit 0.08 USD.

How much family pay phone in the first quarter Q1, if on January 1 had on the counter 97362 units and on April 1 97946 units.

Result

x =  82.72 USD

Solution:

$x = 3\cdot 12 + (97946-97362)\cdot 0.08 = 82.72 \ \text{ USD }$

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