A parking garage rents parking spaces for $10 per week or $40 per month. How much does a person save in a year by renting by the month rather than by the week?  Choose the correct option.
A) $140	B) $160	C) $220	D) $40	E) $260
10$ per week!   An year has 52 weeks.   Annual charges per year = 52* 10= 
<gadget id="calculator">52* 10</gadget>
<output>520</output>
520$   30$ per month!   An year has 12 months.   Annual charges per year= 12 * 40= 
<gadget id="calculator">12 * 40</gadget>
<output>480</output>
480$    520 - 480= 
<gadget id="calculator"> 520 - 480</gadget>
<output>40</output>
40   Ans $40
<result>D</result>
A parking garage rents parking spaces for $10 per week or $40 per month. How much does a person save in a year by renting by the month rather than by the week?