Aclothing store reduces the price of an item by 20% if it is not sold after 3 weeks. it reduces the price a further 30% if the item is still unsold after 6 weeks. and, after 7 weeks if the item is unsold, a further 10% reduction is made. a) estimate the price, after 8 weeks, of a coat that had a regular price of $289.50. b) calculate the sale price, including the sales tax.