Its C. 4.31 x 10^-5 = 0.0000431
Multiply 800 to 4/5 to see how much they make per day.
800 * 4/5 = 640
So, they make 640 fishing reels per day.
Multiply this to 30:
640 * 30 = 19,200
So they will make 19,200 fishing reels in 30 days.
This is not enough for the order.
2+1=3 is not an identity property. The rest are because the value equals itself after dividing, subtracting, and multiplying.