The goods can be bought in the nearest shop at the price of 100 rub/kg, and it is possible in online store at the price of 80 rub/kg with delivery which makes 10% of the cost of goods plus 500 rubles. What minimum quantity of goods, multiple 10 kg it is necessary to order in online store that this order was more favorable, than purchase of the same quantity in the nearest shop?

Let x it is possible to buy kg of goods. In shop it is necessary to pay the 100th rub. In online store goods cost (the 88th +500) rub of the 100th gt; 88x+500; 12x gt; 500 x gt; 500/12 x gt; 41.7 About of t in e t. 50 kg of goods.
Answer add