Question 31774
1.


It doubles every half hour

At 1200hrs it had 1800 double it
At 1230hrs it would have 3600 double it
At 1300hrs it would have 7200 double it
At 1330hrs it would have 14400 double it
At 1400hrs it would have 28800 double it
At 1430hrs it would have 57600 double it
At 1500hrs it would have 115200!

2.
This is a self-explanatory question. It is pretty obvious you have not even attempted this. Please only submit questions to this site when you have absolutely no idea on how to do it. This question has given you the formula and the values you need to use. The answer basically involves a bit of multiplication.