Write an algebraic expression to represent each of the scenarios below.Your answers must be simplified completely.Scenario Algebraic Expressiona)Sales tax is currently 9.1 %. Write an algebraic expressionto represent the total amount paid for an item that costs D dollars after tax is added to the purchase.b)A store is having a 45% off sale. Write an algebraic expression to represent the sale price for an item that is originally priced at D dollars.c)Carmen receives a 3% raise every year. Write an algebraicexpression to represent Carmen's salary after one year if hercurrent salary is S dollars.d)Let B represent the bill for dinner at your favorite restaurant.You decide to leave a 18% tip. Write an algebraic expression torepresent the total amount paid for dinner, including tip.