0.99999999/1.0001−0.99999991/1.0003
Pick: A) 10^(-8 B) 3*10^(-8) C) 3*10^(-4) D) 2*10^(-4) E) 10^(-4)
look at the options closely   A. 0.00000001   B. 0.00000003   C. 0.0003   D. 0.0002   E. 0.0001   Only one option is an even number, the rest odd (an esoteric sort of even/odd number)   both fractions in the question are odds   odd minus odd is always even.   So answer must be even.   Only 2*10^(-4) is even.
<result>D</result>
0.99999999/1.0001−0.99999991/1.0003