The external tank for the space shuttle carried 143,000 gallons of liquid oxygen. A gallon of liquid oxygen weighs 4.322 kg. NASA paid $0.16 per kg for liquid oxygen. How much did NASA spend in total on liquid oxygen for the external Space Shuttle tank for one mission?
a) $987,232
b) $1,239,104
c) $2,478,208
d) $3,717,312