Question

₹18000 for 2½ years at 10%​

Answer 1

p=18000

r=10%

t=5/2

si = p×r×t/100

si=18000×5/2×10

si=450000

Answer 2

For finding Simple interest -----

$simple \: interest = \frac{p \times r \times t}{100 }$

Principle= ₹18000

Rate= 10%

Time= 2 1/2 years =5/2 years

$\frac{18000 \times 10 \times 5}{100 \times 2} \\ = 4500 rs$

So,

Amount= principle+interest

=₹(18000+4500)

=₹22500

Hope it helps।।