1.) Money gains interest at a rate of 50% every 4 years. What is the value of $5,000 after 6 months? After 7 years?

2.) Bacteria double every 30 minutes. How much must you have now in order to have 5 million bacteria in 45 mins?

I don't know why, but these two are giving me trouble. I know you have to use them in the formula A = P(1+r)^t, but the conversions are throwing me off.

Can anyone help??