=9 1÷65%

= 140 (piece)

2、 1-20%-[( 1-20%)x50 %]

=80%-40%

=40%

3、75%+ 1/2- 1

=75%+50%- 100%

=25%

4. Shangzhong Department Store: (5- 1)x60=240 (RMB)

Pan Pan Supermarket: 5x60x80%=240 yuan

Buying five is as cheap as buying two!