1、5.7%+1.3%+5.7%×1.3%

A 6.9% B 7.0% C 7.1% D 8%

2、13%+14%+13%×14%

A 26.6% B 27.0% C 28.8% D 29.4%

3、13.7%+5.7%+13.7%×5.7%

A 19.4% B 19.6% C 20.2% D 20.3%