Answer: interest
- the feeling of wanting to know or learn about something or someone
 - money paid regularly at a particular rate for the use of money lent, or for delaying the repayment of a debt.
 
simple interest
- Simple interest is a quick and easy method of calculating the interest charge on a loan. Simple interest is determined by multiplying the daily interest rate by the principal by the number of days that elapse between payments. 
 
Simple Interest=P×I×N 
where: 
P=principle 
I=daily interest rate 
N=number of days between payments 
 
Explanation: