Average 81602

A monthly fee of 60 crowns is paid for the phone and 3 crowns for each call. How many calls did we have when one call cost us an average of 4 crowns and 20 pennies?

Correct answer:

n =  50

Step-by-step explanation:

h=4.20 SK  h n=60+3 n 4.2 n=60+3 n  1.2n=60  n=1.260=50  n=50

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