need asap pls

Desert Smile store in Tucson had $245,000 of gross sales and 7.5% of customer return in 2017. The store had gross margin of 42.0%, total expenses 29.5% including $5,000 of advertising, markdown of $52,123.75, shortages of 2.5%, in the same year. What is the store's initial markup percentage ( 3 points)