**Def. of Simple Interest:**Simple interest is a method to calculate the amount of interest charged on a sum at a given rate and for a given period of time.**Formula for Simple Interest:**Simple Interest (SI) = (P * R * T) / 100, where P is the interest, R is the rate and T is the time period.- Principal (P) = 100 * SI / (R * T)
- Rate (R) = 100 * SI / (P * T)
- Time (T) = 100 * SI / (R * P)
- Amount (A) = P + SI => P + (P * R * T) / 100
- If a certain sum of money becomes n times itself at R% p.a. simple interest in T years, then T = [(n-1)/R] * 100 years
- If a certain sum of money becomes n times itself in T years at a simple interest, then the time T’ in which it will become m times itself is given by T' = (m-1 / n-1) * T years
- If a certain sum of money P lent out at SI amounts to A
_{1}in T_{1}years and to A_{2}in T_{2}years, then

P = (A_{1}T_{2}-A_{2}T_{1}) / (T_{2}-T_{1}),

R = (A_{1}-A_{2}) / (A_{1}T_{2}-A_{2}T_{1}) * 100% - If a certain sum of money P lent out for a certain time T amounts to A
_{1}at R_{1}% per annum and to A_{2}at R_{2}% per annum, then

P = (A_{2}R_{1}-A_{1}R_{2}) / (R_{1}-R_{2}),

T = (A_{1}-A_{2}) / (A_{2}R_{1}-A_{1}R_{2}) * 100 years - In general, interest is considered to be Simple unless otherwise stated.

A. Rs. 2,850

B. Rs. 3,587.50

C. Rs. 3,750

D. Rs. 3,770.50

A. 7 1/2 years

B. 7 1/3 years

C. 8 1/3 years

D. 9 years

A. Rs. 1,550

B. Rs. 1,650

C. Rs. 1,750

D. Rs. 1,850

= (4000 * 11/10 * 11/10 – 4000) = Rs. 840

Sum = (420 * 100)/(3 * 8) = Rs. 1750

A. Rs. 1,000

B. Rs. 1,200

C. Rs. 1,300

D. Rs. 1,500

X = 1000

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A. 12 1/2%

B. 14 4/7%

C. 15 2/3%

D. 16 2/3%

A. Rs. 17,000

B. Rs. 18,000

C. Rs. 19,000

D. Rs. 20,000

A. Rs. 590

B. Rs. 668

C. Rs. 698

D. Rs. 700

S.I. for 3 years = Rs.(39 * 3) = Rs. 117

Therefore, Principal = Rs. (815 – 117) = Rs. 698

A. Rs. 8,725

B. Rs. 8,825

C. Rs. 8,875

D. Rs. 8,925

= Rs. (401625 / 45)

= Rs. 8,925

A. 3%

B. 6%

C. 9%

D. 12%

A. 3.6 years

B. 4 years

C. 4.6 years

D. 5 years

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