can any math genius out there help me?

Test Preparation SAT Preparation
18

<p>it would be =</p>

<p>(1/1000*0.95) / ((999/1000 *0.01)+(1/1000 * 0.95))
0.00095 / (0.00999+ 0.00095)
0.00095/ 0.01094
0.0868
0.087
so yeah 8.7% is correct</p>