Rabbi Shneur Zalman Fradkin of Lublin [1830-1902], A chasid of the Tzemech Tzedek and Maharash of Lubavitch, was chief rabbi in Polotsk and then Lublin. When he made aliyah to the Holy Land, he became a major rabbinical figure in the Jerusalem community.
In the first quarter of 2014, 198 million U.S. consumers bought something online, according to comScore's quarterly State Of Retail report. That translates to 78% of the U.S. population age 15 and above.
The next step is to calculate how much of that money goes to the retailer. Suppose the retailer takes 12.5% of the retail price. This percentage is called the retailer gross margin: Retailer gross margin (%) D = 12.5%.