PLEASE HELP ASAP, WILL GIVE BRAINLIEST 1) Interest earned on both the principal and any interest that has already been earned; the amount on which the interest is paid increases over time; it pays interest on interest.
2) The original amount of money that the interest is based on.

3) The cost to borrow money (through a loan or credit card) or the amount earned by lending money (or placing money in a savings account)

4) Interest earned or paid only on the principal, or initial deposit.

Interest
Simple Interest
Compound Interest
Principal