1: Xiaoming originally lived in 28 yuan. Because Xiao Ming donated more 12 yuan than Xiao Gang, and Xiao Ming's pocket money was three times that of Xiao Gang, so it was four yuan each, Xiao Ming 28 yuan and Xiao Gang 16 yuan.

This dress is sold in 660 yuan.

Suit: The original price of this dress is X yuan.

( 1- 10%)* X * 1.2 = 1. 1X- 12

1.08 x = 1. 1X- 12

1. 1X- 1.08 x = 12

X=600

600+600* 10%

=600+60

=660 (yuan)