[thÃch má»™t mình nhưng ghét cô đơn] [lá»ÂÂa vÃÂÂ] [���饧�] [%B4%F3%D0ͤϤ%B7%A4%B4] [tran thuy mai] [ARK ユウã‚ãƒãƒªãƒžãƒ¼] [tiếng anh cho ngưỠi tá»± há» c] [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] [Xã há»™i háºÂÂu tư bản] [Rank 2: %C6%FB%B3%B5%C1㲿%BC%FE%D4%CB%CA%E4 %D0%D0ҵ%B1%EA]