Infosys Company Numerical Ability Simple & Compound Interest

A sum of money amounts to 9800 after 5 years and 12005 after 8 years at the same rate of simple interest. The rate of interest per annum is:
a)5%
b)8%
c)12%
d)15%

Read Solution (Total 2)

12%

A sum of money amounts to 9800 after 5 years and 12005 after 8 years at the same rate of simple interest.
Interest for 3 years = 12005-9800= 2205
Interest for 1 year = 2205/3 = Rs. 735
Int for 5 yrs = Rs. 3675

Principal = 9800-3675 = Rs. 6125

Rate of interest = 735*100/6125 = 12 %
12 years agoHelpfull: Yes(11) No(1)

S.I. for 8 years - S.I. for 5 years = S.I. for 3 years = 12005 - 9800 = 2205

IF S.I. FOR 3 YEARS IS 2205
S.I. FOR 1 YEAR IS 2205/3 = 735
then, S.I. for 5 Years is 735*5 = 3675

P = ( 9800 - 3675 ) = 6125

Rate of interest = (100 * 3675 )/6125*5 = 12%
9 years agoHelpfull: Yes(1) No(0)

Infosys Other Question

A sum of 725 is lent in the beginning of a year at a certain rate of interest. After 8 months, a sum of 362.50 more is lent but at the rate twice the former. At the end of the year, 33.50 is earned as interest from both the loans. What was the original rate of interest?
3.6%
4.5%
5%
6%
None of these What will be the ratio of simple interest earned by certain amount at the same rate of interest for 6 years and that for 9 years?
1 : 3
1 : 4
2 : 3
Data inadequate
None of these