Your answer is: 63 is 90% of 70.
The work (if needed) is shown above :)
39 + 0.16m = 25 + 0.24m
39 - 25 = 0.24m - 0.16m
14 = 0.08m
14 / 0.08 = m
175 = m <=== they will cost the same at 175 miles
39 + 0.16(175) = 39 + 28 = $ 67
25 + 0.24(175) = 25 + 42 = $ 67
they will both cost $ 67 <=====
185% = 185/100
185/100 = 37/20
The simplest form fraction of 185% is 37/20.