Example 1: A sum of Rs 12,000 at simple interest amounts to Rs. 15,000 in3 years Find rate %. SI=15000-12000=3000Rs. SI= P*r*t/100 Rate= 3000*100/12000*3 =8.3% Example 2: what annual payment will discharge at a debt of Rs 750 due in 5 years, the rate of interest given is 5% per annum? Direct Formula Annual payment=

Whenever we keep any amount on bank we are paid interest. The interest is usually specified as, say4% per annum. 4 % Per annum means if money invested is 100then interest is 4 % i.e. 4 Rs every year. Principal: Which is denoted by P. The money lent for certain period is called principal. Amount:

Example 1 : Find 8 percent of Rs. 225. 8% of 225=8*225/100 2/25*225=18 Rs Example 2: Express 20, as a percentage of 40. 20/40 *100 =50% Example 3: The population of town has increased from 50,000 to 60,000, find increased percentage? Increase in population= 60,000-50,000=10,000 Percentage increase= 10,000/60,000 *100 =100/6% Example 4: In a basket

We all use percentage in our daily routine. The term percent mans for every hundred. In its simplest sense percent i.e. per hundred. Thus the expression 20% means 20/100 To express n% as a fraction: n%/100 To express a/b as percentage: (a/b x 100)% Thus 3/5= (3/5 x100)% =60% For example: India won 50% of

A Lot of students find Mathematics as a very difficult subjects as it involves mental exercise. Calculation speed plays very important role during competitive exams as lots of exams are based on speed test. Most of students are accustomed of using calculator during their graduation so they find difficult to calculate fast during competitive exams.