Let the principal be Rs. P and the rate be R% per annum
Since it doubles in 12 years.
So, simple interest is Rs. P
12R = 100
Hence, rate = % per annum
Ronika deposited Rs.7000 which amounted to Rs.9200 after 3 years at simple interest. Had the interest been 2% more. She would get how much ?
As the interest rate increases by 2%=> (7000x3x2)/100 = 420 9200 -------- 9620
If J is the interest on K and K is the interest on L, the rate and time is the same on both the cases. What is the relation between J, K and L ?
Let the Time be 'N' and Rate be 'R'
J = (K x NR)/100 K = (L x NR)/100
J/K = NR/100 K/L = NR/100
J/K = K/L
At what rate percent on simple interest will Rs.415 amount to Rs.514 in 4 years ?
Difference in amount = 514 - 415 = 99
99 = (415 x 4 x R)/100
R = 5.96%
A sum of money at simple interest amounts to Rs. 415 in 2 years and to Rs. 514 in 4 years. The sum is ?
S.I. for 2 years = (514 - 415) = Rs. 99S.I. for 1 year = 99/2
Principal = (415 - 99) = Rs. 316.
A lady took loan from a bank at the rate of 12% p.a. simple interest. After 3 years she had to pay Rs. 5400 interest only for the period. The principal amount borrowed by her was :
Principal = Rs.(100 x 5400)/(12 x 3)= Rs. 15000.
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