设完好的为x个,由题意得:
(1+50%)x+(1000-x)×(1-10%)-1000=1000×39.2%,
1.5x+900-0.9x-1000=392,
(1.5-0.9)x=1000-900+392,
0.6x=492;
x=820;
1000-820=180(个);
答:运输过程中破损了180个.