一道GMAT数学题ThisyearHenrywillsaveacertainamountofhisincome,andhewillspendtherest.NextyearHenrywillhavenoincome,butforeachdollarthathesavesthisyear,hewillhave1+rdollarsavailabletospend.Intermsofr,whatfract

　　一道GMAT数学题

　　ThisyearHenrywillsaveacertainamountofhis

　　income,andhewillspendtherest.NextyearHenry

　　willhavenoincome,butforeachdollarthathesaves

　　thisyear,hewillhave1+rdollarsavailabletospend.

　　Intermsofr,whatfractionofhisincomeshouldHenry

　　savethisyearsothatnextyeartheamounthehas

　　availabletospendwillbeequaltohalftheamountthat

　　hespendsthisyear?

　　foreachdollarthathesaves

　　thisyear,hewillhave1+rdollarsavailabletospend.

　　完全不懂这句话……求解!