When someone lends money to other He tries to take interest over the money landed. Generally, he takes the simple or compounded interest Terms related: principle: Amount amount one lends Interest: Extra money one asks when he lends money Rate: Rate at which lender charge interest time= Duration for which the lender lends money to someone Simple Interest: Let 's take that one person lends 100 rs to someone at a simple interest rate of 5 yearly.Then he will receive 5 rs as interest at end of 1st year. 10 rs at the end of 2nd year, 15 rs as interest at the end of 3rd year. Let's take someone lends 100rs for 3 years at a simple interest of 5% then He will receive 100+5*3=115 Let 's say a person lends money x at the simple interest rate of d% then He will receive. d rs every 100 rs every year. Simple Interest: (principle*rate*time(year))/100 Total amount = principle+ Simple interest Compound Interest: Let 's take that one person lends 100 rs to someone at...