Microsoft wants to calculate the effect of a worldwide 5 percent price cut on its sales of Excel to clients in different countries. Microsoft sells Excel at different prices in US, Japan and Europe. Before the price cut US sales were twice sales in Japan and Europe each. If the price of elasticity of demand in the US, Japan and Europe are -3, -4, and -2 respectively, the worldwide sales rise by

A) 10 percent

B) 15 percent

C) 20 percent

D) 25 percent

E) none of the above