text: i forgot how to do percents.....!? whats 90.% of 3.0*10^8? 90% of 3.0 * 10^8  think of it like this  (90/100) or (9/10)  (9/10) * (3.0 * 10^8)  (9 * 3.0 * 10^8)/10  (27.0 * 10^8)/10  (2.7 * 10^9)/10  (2.7 * 10^9)/(1 * 10^1)  (2.7/1) * ((10^9)/(10^1))  2.7 * 10^8  the easiest way would to be to say .9 * 3 * 10^8, which would have given you 2.7 * 10^8