a customer paid 330 for 220 telephone calls.the telephone charges increased by 10% what should be the percentage reduction in the number of calls in the order to keep the expenditure over telephone sanu
Answers
Given : a customer paid 330 for 220 telephone calls.
the telephone charges increased by 10%
To Find : what should be the percentage reduction in the number of calls in the order to keep the expenditure over telephone
Solution:
a customer paid 330 for 220 telephone calls.
=> Paid per call = 330/220 = 3/2
the telephone charges increased by 10%
=> Charges per call = (3/2) + (10/100)(3/2)
= (3/2)(1 + 1/10)
=(3/2)(11/10)
= 33/20
Expenditure = 330
Number of calls = 330/(33/20) = 200
Reduction in calls = 220 - 200 = 20
percentage reduction in the number of calls = (20/220) * 100
= 200/22
= 100/11
= 9.09 %
9.09 % reduction in the number of calls in the order to keep the expenditure over telephone
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