3. A furniture store has a sale of 40% on selected items, A sales assistant, Carol, reduces the price of a sofa originally costing $1200. (a) What is the new price? The manager does not want this sofa to be in the sale and the following day tells another sales assistant, Michael, to restore the sofa back to the original price. He does not know what the original price was and decides to show off his mathematical knowledge by taking the answer to part (a) and multiplying it by 1.4. (b) Explain carefully why this does not give the correct answer of E1200. (c) Suggest an alternative calculation that would give the right