[Giáchơi] [ Tri��] [cách ná» n kinh tế váºn hÃ] [5 ng] [tố nữ] [This year, Henry will save a certain amount of his income, and he will spend the rest. Next year, Henry will have no income, but for each dollar that he saves this year, he will have 1 r dollars available to spend. In terms of r, what fraction of his income should Henry save this year so that next] [Cha me chua] [Organon] [ncdj06.com] [Phươngphápđọcsách]