Question

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

Answer 1

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 2

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

Hope u find this helpful