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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

Read Solution (Total 1)

si=p*t*r/100
using this formula
si1+si2=(p1*t1*r/100)+(p2*t2*2r/100)
si1+si2=33.50
p1=725
t1=1 years
p2=362.50
t2=0.33 yrs
putting these values we wil get r=3.45
12 years agoHelpfull: Yes(1) No(2)

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An automobile financier claims to be lending money at simple interest, but he includes the interest every six months for calculating the principal. If he is charging an interest of 10%, the effective rate of interest becomes:
10%
10.25%
10.5%
None of these 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:
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c)12%
d)15%