1.4个一盒,5个一盒,6个一盒,10个一盒,12个一盒.
2.3.12-2.70=0.42(元)
0.42÷2=0.21(元)
(2.70-2×0.21)÷6=0.38(元)
答:碗0.38元一个,盘子0.21元一个.