Respuesta :

Multiply 9900 by the decimal for 10%:

9900 x 0.10 = 990

10 / 100 = Part / 9900

Cross multiply:

10 x 9900 = 100 x Part, or

99000 = 100 x Part

Now, divide by 100 and get the answer:

Part = 99000 / 100 = 990