Solve with explanation please for no a and b URGENT
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(a) It is seen that for 30$ talk time is 100min
so for per min charges is
30/100 = 0.3$ or 30 cent/min
(b)0.3$ for 1 min
so for 51.8 $ talk time will be
= 51.8÷0.3
=172.67 min
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