Need help please, thank you.

P= $1400,300 r = 7 1/2% t = 4 what is i ? $4.29 $429.00 $4290.00

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?