急~~帮忙,英文数学题!
问题描述：
急~~帮忙,英文数学题!
An item marked at $M is sold at a discount of 2%. If the selling price of the item is $(M-0.12),find the value of M.
答
m*(1-2%)=m-0.12
0.98m=m-0.12
m=6