Answer:
5.35
Step-by-step explanation:
11/36. You need to make both denominators the same
Answer: 19 years
Step-by-step explanation:
Given
Amount invested 
Rate of interest 
after 1-year amount becomes

After n years it is

Sum accumulated is 

0<r<6
the least number of ride he can go on is 0 which is none and the most is 6 because 15/2.50=6