The total cost of goods is100×100 =10000.
Then according to the profit of 30%, the price is 130, the sales rate is 70%, and the sales income is 130×70=9 100.
The remaining 30% is sold at half the price of 65, and the sales income is 65×30= 1950.
Total sales revenue is 9100+1950 =11050.
The profit is11050-10000 =1050.