a mobile company charges s fixed amount as monthly rental which includes 100 mins free per month and charges for every additional minute.abay paid 433 rs for 370 rs and anitha paid 398 rs for 300mins find their bill amounts ,if karena used for 400 mins
Answers
Answer:
448 rs
Step-by-step explanation:
a mobile company charges s fixed amount as monthly rental which includes 100 mins free per month and charges for every additional minute.abay paid 433 rs for 370 mins and anitha paid 398 rs for 300mins find their bill amounts ,if karena used for 400 mins
let say fixed charges = F rs
variable charges per min after free mins = V
370 mins = 100 + 270 mins
charges F + 270V = 433
300 mins = 100 + 200 mins
charges F + 200V = 398
70V = 35
V = 0.5
F + 200×.5 = 398
F = 298
400 mins = 100 + 300
298 + 300*.5
= 298 + 150
= 448
Answer
Step-by-step explanation:
Let, fixed charge = rs. x
additional charge per min = rs. y
Case 1
x + 370y = 433 - i
x + 300y = 398 - ii
i - ii
70y = 35
y = 1/2
From equ i - x + 370y = 433
x + 370 (1/2) = 433
x = 433 -185
x = 248
therefore, fixed charge = rs. 248
additional charge per min = 1/2
Case 2
=x + 400y
=248 + 400 (1/2)
=248 + 200
=rs. 448
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