If 20 percent of 40 percent of a number is 10 greater than half the number, what is the number?A. -500/21B. -500/3C. 200D. 200/21E. 210

0.2*0.4n = 0.5n + 10

0.08n = 0.5n + 10

-0.42n = 10

n = 10/-0.42

n = -500/21