Multiplying 0.25by18yields4.50, which is the cost of the 18 pens; and multiplying 0.35by100yields35.00, which is the cost of the 100 markers. The total cost is therefore Equivalent decimals, such as 39.5or39.500, are considered correct. Thus the correct answer is $39.50 (or equivalent).
Note that the dollar symbol is in front of the answer box, so the symbol $ does not need to be entered in the box. In fact, only numbers, a decimal point and a negative sign can be entered in the answer box.