sondenso wrote:
GMAT TIGER wrote:
goodglory wrote:
A certain taxi company charges $3.10 for the first 1/5 of a mile plus 0.40 for each addtional 1/5 of a mile. What would this company charge for a taxi ride that was 8 miles long?
A. 15.60
B. 16.00
C. 17.50
D. 18.70
E. 19.10
= 3.10 + (8 - 0.2) 0.4/
0.2= 3.10 + 15.6
= 18.7
Dear Gmatiger
Can you help me to understand why the result must be divided into 0.2?
I am confused!
Thanks,
it is just an unitary method:
The cost per 1/5 (0.2) miles is 0.4 beyond first 1/5 (0.2) miles.
so 0.2 miles costs 0.4, then how much 1 mile costs? 2. how 0.4/0.2 = 2.
so 1 mile costs 2, then 7.8 (=8-0.2) miles cost 7.8x2 = 15.6
so total = 3.1+15.6 = 18.7