When calculating simple interest by days use the number of days for t and divide the interest rate by 365. After one year you will have 105 and after two years you will have 110. A Total Accrued Amount principal interest P Principal Amount.
R Rate of Interest per year in decimal.
This time period usually would be in years. The Formula for simple interest helps you find the interest amount if the principal amount rate of interest and time periods are given. Simple Interest Principal Interest Rate Time Period. The formula for this is.