Compound Interest Part 6

Problem 1: P=21600, R=16\tfrac{2}{3}%, T=3yers, C.I=?

Solution:

Fraction for 16\tfrac{2}{3}% is \frac{1}{6}

36+36+36+6+6+6+1=127

216———–>21600

127———–>?

\frac{21600\times 127}{216}=12700 is principle.

Problem 2: P=?, R=15%, T=3years, C.I-S.I=1701

Solution:

Fraction for 15% is \frac{3}{20}

20*20*20=8000

180+180+180+27=567

567————->1701

8000————->?

\frac{1701\times 8000}{567}=24000

Problem 3: P=?, T=3 years, 3rd-year C.I-2nd year C.I=420,R=16\tfrac{2}{3}%

Solution:

Fraction for 16\tfrac{2}{3}% is \frac{1}{6}

7——->420

216——>?

\frac{420\times 216}{7}=12960 is principle

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