Question

The si on asum of money will be rs600 after 10 yeard.If the principal is trebled after 5 years what will be the total interest

Answer 1

Step-by-step explanation:

explained above with formula applied

Answer 2

Answer:

SI is calculated as (Principal) *(100 + interest rate)/100 * (Time)

600 = principle * (100 + interest rate )/100 * 10

6000 = principle * (100 + interest rate)

now, we take the interest rate as 'x'

taking principle amount as 'p'

6000 = p*(100 + x)

as the principle amount is trebled after 5 years, we take the first 5 years to have principle amount as 'p' while the next 5 years, the principle is '3p'.

SI¹ = p* (100 + x)/100 * 5

SI¹ = p* (100 + x)/20

SI² = 3p* (100 + x)/100 * 5

SI² = 3p* (100 + x)/20

total interest = SI¹ + SI²

= p*(100 + x)/20 + 3p*(100 + x)/20

= (p + 3p) (100 + x)/20

= 4p * (100 + x)/20

= p* (100 + x)/5

= 6000/5

= 1200

final answer- total interest = 1209