HELP WITH MATH! simple and compounded intrest!?

hi! my teacher does a part of a chapter each day like to day wuz 3.8 yesterday wuz 3.7, b4 tat 3.6. and there is not enough time to review much or anything so please help! its 1-16!!!!!

find the amount of the simple interest earned for #'s 1 through 8

1) principal: $620

annual rate: 3.5%

time: 2 yrs.

2) principal: $500

annual rate: 6.5

time: 32 months

3) principle: $750

annual rate: 3.5%

time: 18 months

4) principal: $2000

annual rate: 4%

time: 5 yrs.

for an account that earns simple annual intrest, find the balance of the account.

this might help!:

I = prt I= intrest P= principle R= intrest rate T= time in years (not months)

5) P=$400,r = 3%,t=6 years

6)p=$950, r =4.5,t = =5 yrs.

7) p= $1500,r=2%,t = 4months

8)p = $2400, r = 3.25 t,= 5 years

9 -13 needs to be a COMPOUND INTREST

9) principle $1200

annual rate: 4%

time: 3 years

10) princible: $3500

annual rate: 3.6%

time: 54 months

11) principal: $840

annual rate: 2.75%

time: 3 yrs.

12) principal: $1550

annual rate: 5.8

time: 54 months

13) you deposit $700 in a saving account that pays 4.2% simple annual interest. how much will you have in you account after 63 months?

14) on january 1st, a credit card has a balance of $680 the credit card company charges an interest rate of 18.5% compounded annually. if no payment or purchases are made, what is the balance on febuary 1st?

15) the account below earn intrest compounded annually. which account will have the greater balance in the given time? explain your reasoning.

Account A Account B

principal:$350 principal: $350

annual rate: 2.25% annual rate: 4.5

time: 20 yrs. time: 10 yrs.

16) how much money must yu deposit into a savings account that pays 4.8% simple annual intrest to have a balance of $1850 after 10 yrs?

please, this is weird but when summiting your answer, please do NOT show your work! and please do this:

1. your answer

2. your answer

ect....

THANKS FOR THE HELP!!!!!!