23/100×$640=147.2 is the answer
I believe C, because you are dividing 4 into the Length and the Width.
Forgive me if I am incorrect :))
Move the decimal's place 7 times to the right. That means that 12.5*10^7 = 125*10^6. Now add 6 zeros: 125,000,000.
You can actually use a calculator to check your answers if it is allowed.
