Q. 22 D

# What is the rate of simple interest per annum, when the interest of some money in 10yrs. will be part of its amount (principal along with interest)-Let us determine it.

Answer :

Say rate of simple interest per annum is ‘r’

Given: Interest of some money will be

Let’s Principal be ‘P’

⇒ Interest =

P = P, r = r, t = 10 years and I =

Since,

⇒ r = 4%

Rate this question :

If the total interest becomes ₹ x for any principal having the rate of simple interest of x% per annum for x years then the principal will be

West Bengal Board - MathematicsA principal becomes twice of its amount in 20 yrs at a certain rate of simpleinterest. At the same rate of simple interest, that principal becomes thrice of its amount in

West Bengal Board - MathematicsA weaver Cooperative society takes a loan of ₹15,000 at the time of buying a power loom. After 5 yrs. the society has to repay ₹22125 for recovering the loan. Let us determine the rate of simple interest in percent per annum.

West Bengal Board - MathematicsIf the interest of ₹p at the rate of simple interest of r% per annum in t years is I,then

West Bengal Board - MathematicsMannan Miyan observed, after 6 years of taking a loan of some money, that the interest to be paid had become th of its principal. Let us determine the rate of simple interest in percent per annum.

West Bengal Board - MathematicsIf I get ₹1200 return as amount (principal along with interest) by depositing ₹800in the bankat the rate of simple interest of 10% per annum, then let us write by calculating, the time for which the money was deposited in the bank.

West Bengal Board - MathematicsLet us write by calculating, the number of yrs for which an amount becomes twice of its principal having the rate of simple interest of 6% per annum.

West Bengal Board - MathematicsIf the interest of ₹292 in 1 day be 1 paise, then let us write by calculating, the rate of simple interest in percent per annum.

West Bengal Board - Mathematics