hope all is well during this time, I had trouble understanding the concept

A buyer had an inventory of $90,000 on June 1 and a planned EOM stock of $101,000. Planned sales for the department were $38,000, and planned markdowns for the month were $6,400. As of June 1, the buyer had merchandise on order of $25,000 at retail to be delivered during the month. Planned initial markup was 48%. Calculate the buyer's OTB at retail as of June 1. Given the OTB at retail you calculated in #1, calculate the same OTB in cost dollars. A buyer's sales for October are estimated at $15,000. Her stock on October 1 is $38,000, and she has $11,000 stock at retail on order for the month. Markdowns are planned at 8% for the month, and the planned EOM stock is $40,000. Determine the OTB on October 1? A buyer had an inventory at the beginning of the month of $120,000 and a planned EOM stock of $135,000. On the rst of the month the buyer had merchandise on order of $55,000 to be delivered during the month. Planned markdowns for the month were $7,000 and planned sales were $85,000. The planned initial markup was 51%. Find the buyer's OTB for the month at retail. Given the 0TB in #4, calculate the OTB in cost dollars