step by step explaination....
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Step-by-step explanation:
1st question
P=Rs 640
r=25/2%
t=6 months=1/2years
I=(P×r×t)/100
=(640×25×1)/2×2×100
=Rs 40
A=P+I
=Rs 640+Rs40
=Rs680
2nd question
P=Rs 10000
r=18%
t=7yrs
I=(P×r×t)/100
=(10000×18×7)/100
=Rs 12600
A=P+I
=Rs10000 +Rs 12600
=Rs 22600
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