extra math lesson your ignorance is excused, although it may get you in to trouble if your investing is stuff you don't understand very well. If you google this stuff you find some helpful websites that explain it all, but it may put you to sleep.
In Greek Numerals M is 1000 there is about 1000btus is 1 cubic foot of gas and 1MBH of gas is 1000 cubit feet of gas. 1000 cubic feet of gas (1MBH) is what you pay $3.98 for. so 4 200 000 divided by 1000 = 4200MBH's
4200 x$3.98 = 16K and change per day....... and then all the rest of the stuff I said.
Good luck!
sd2