Let *** 100 pieces, the cost of each piece is 1 yuan, and the cost is =100×1=100 yuan.

* * * Sold:

100×90%×( 1+40%)+ 100× 10%×( 1+40%)×0.5

= 126+7

= 133 (yuan)

therefore

Profit:

( 133- 100)÷ 100× 100%

=33%