**Problem 1:** P=21600, R=%, T=3yers, C.I=?

Solution:

Fraction for % is

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

216———–>21600

127———–>?

is principle.

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

Solution:

Fraction for 15% is

20*20*20=8000

180+180+180+27=567

567————->1701

8000————->?

**Problem 3:** P=?, T=3 years, 3rd-year C.I-2nd year C.I=420,R=%

Solution:

Fraction for % is

7——->420

216——>?

is principle