If Sharon's weekly salary increased by 16 percent, she would earn $406 per week. If instead, her weekly salary were to decreased by 10 percent, how much would she earn per week?  Choose the most appropriate option.
A) Rs.415  B) Rs.325  C) Rs.352  D) Rs.315  E) Rs.425
Soln:-   (406/116)90 =315   In this case long division does not take much time.   (406/116)= 
<gadget id="calculator">(406/116)</gadget>
<output>7/2 = around 3.5</output>
3.5   3.5*90=Rs.315   ANSWER:Rs.315
<result>D</result>
If Sharon's weekly salary increased by 16 percent, she would earn $406 per week. If instead, her weekly salary were to decreased by 10 percent, how much would she earn per week?