There are basically two kinds of simple interest: ordinary and exact. These two terms uses the same formula for solving the simple interest but they differ on using the time.
Ordinary simple interest is a simple interest that uses 360 days as the equivalent number of days in a year. On the other hand, Exact simple interest is a simple interest that uses exact number of days in a year which is 365 (or 366 for leap year).
These two kinds of simple interest are only applicable if the unit of time used is in days.
Principal amount is $15,000.
Rate of interest is 6%.
Counting the number of days from May 30 to August 10;
Note: Since May 30 is the beginning date, it is not included in counting.
May 31 1
June 1-30 30
July 1-31 31
August 1-10 10 Total 72 days
72 days x `((1 year)/(360 days ))` = `1/5 years`
Using the formula for solving the simple interest;
Interest = Principal x Rate x Time
Interest = $15,000 x 6% x `1/5`
Interest = $15,000 x 0.06 x `1/5`
Interest = $180
Therefore, the businessman will pay $180 interest.
Principal amount is $1,800.
Rate of interest is 8%.
Counting the number of days from December 25 to February 14;
Dec 25-31 6
Jan 1-31 31
Feb 1-14 14
Total 51 days
51 days x `((1 year)/(365 days ))` = `51/365 years`
Using the formula for solving the simple interest;
Interest = Principal x Rate x Time
Interest = $1,800 x 8% x `51/365`
Interest = $1,800 x 0.08 x `51/365`
Interest = $20.12
Therefore, the Louie will pay $20.12 interest.
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