Gilbert's expects its September sales to be 20% higher than its August sales of $150,000. Manufacturing costs were $100,000 in August and are expected to be $120,000 in September. All sales are on credit and are collected as follows: 30% in the month of the sale and 70% in the following month. Payments of manufacturing costs are as follows: 25% in the month of production and 75% in the following month. The beginning cash balance on September 1 is $7,500. The ending balance on September 30 would be Oa. $75,000 Ob. $61,500 Oc. $72,300 Od. $71,500