Question

Mobile phone calls are charged at 17 cents per 30 seconds.

Answer 1

0.17/30 = x/450 Use proportion

76.50 = 30x Cross multiply

2.55 = x Divide 30 both sides

7.5 minutes call would cost 2.55

Answer 2

Answer:

255 ¢ or 2.55$

Step-by-step explanation:

i counted like this

l    30 seconds   = 1

l    1 minute         = 2

l    1.5 minutes    = 3

l    2 minutes      =  4

l    2.5 minutes   =  5

l    3 minutes      =  6

l    3.5 minutes   =  7

l    4 minutes      =  8

l    4.5 minutes   = 9

l    5 minutes      = 10

l    5.5 minutes   = 11

l    6 minutes      =  12

l    6.5 minutes   = 13

l    7 minutes      = 14

l    7.5 minutes   = 15

 So then 17 ¢ x 15 = 255 ¢

Hope it helps