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1.} S.I ==> P×R×T
100
==> 6400×6×2
100
=> 64×6×2
=> 768
2.} C.P => 90
S.P => 100
C.P < S.P
so , there is gain.
gain => S.P - C.P
=> 100 -90
=> 10 rs
gain % => gain × C.P
100
=> 10 × 90
100
=> 9%
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Answer:
36. principal =Rs 6400
rate of interest =6%
time =2years
s.i= p * r* t/100
6400*6*2/100
Rs 768
37. c. p. of pen =RS 90
s. p. of pen = Rs 100
gain= s. p. -c. p.
100-90
10
gain%= gain/c.p.*100
10/90*100
11.11%
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