Profit margin is the ratio of sales price minus cost, which can be calculated by the following formula: profit margin = (sales price-cost)/sales price.

Known profit margin: 30%

Known cost: 1 yuan.

According to the profit rate formula, the following equation can be obtained:

Profit rate = (sales price-1)/ sales price

Convert percentages to decimals and get the following equation:

0.3 = (sales price-1)/ sales price

Transform this equation to obtain the following equation:

Sales price = (1+0.3 times sales price)/USD 0.7.

According to the above equation, the following calculation formula can be obtained:

Sales price =( 1+0.3 \ times the sales price) /0.7

So, the price is:

$ (1+0.3 \ times1)/0.7 =1.8571428571428574 Yuan $