Question

the simple interest on 40000 for 8.5 months at 9% per annum is

Answer 1

si=ptr/100

Here time is given in months.We must convert it into years

12months----->1 year

8.5 months will be  8.5/12 i.e., nearly 0.7 year

=>si=(4000*0.7*9)/100

si=252/-

Answer 2

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Here is your answer

P = 40000
R = 9%
T = 8.5 month. = 8.5/12 years


As
SI = PRT/100
$= \frac{40000 \times 9 \times 8.5}{100 \times 12} \\ = 2550$
Hence simple interest is Rs 2550

Hope it helps you