A parking garage rents parking spaces for $10 per week or $20 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) $240
E) $280
10$ 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 * 20= 
<gadget id="calculator">12 * 20</gadget>
<output>240</output>
240$    520 - 240= 
<gadget id="calculator"> 520 - 240</gadget>
<output>280</output>
280   Ans $280
<result>E</result>
A parking garage rents parking spaces for $10 per week or $20 per month. How much does a person save in a year by renting by the month rather than by the week?