# Rai is considering two mobile phone plans that charge. For each call made the charges are shown below Mobile plan a monthly subscription \$10 cost per minute 21.4 cents per minute Mobile plan b monthly subscription \$14 cost per minute 18.5 cents minutes On average rai uses n minutes of calling time each month A) write an expression for the total charges for rais usage based in each mobile plan B) if n= 100 find the total cost for each mobile plan which mobile plan should rai choose ?? Justify your choice

1

2014-11-30T16:27:20+05:30

### This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
A)
For plan a
subscription cost = \$10
call rate = 21.4 cents/minute = \$ 0.214
If Rai uses n minutes in a month
Total charges per month = 10 + n×0.214 = \$ (10+0.214n)

For plan b
subscription cost = \$14
call rate = 18.5 cents/minute = \$ 0.185
If Rai uses n minutes in a month
Total charges per month = 14 + n×0.185 = \$ (14+0.185n)

B)
if n=100
charge in plan a = \$ (10+0.214×100) = \$ 31.4
charge in plan b = \$ (14+0.185×100) = \$ 32.5
So he should choose plan a.
great sir thank, you
you are welcome!!