请教本月（2014.6）数学鸡精188题

wwdenv

请问这道题怎么想呢？ 10 percent maximum error 是误差在10%内的意思吗？ 那就是95%~110%都可以？ 具体怎么列式子还是想不出来 。。

188. by xperilla
A couple is working on the family budget, which only include food consumption F and tax liability T. There is 10 percent maximum error on F budget and 15% on T. ask what is the total percent of maximum error?
12.5%  
(10%F+15%T)%
[(10&F+15%T)/(F+T)]%
[(110&F+115%T)/(F+T)]%