A clock store sold a certain clock to a collector for 20 percent more than the store had originally paid for the clock. When the collector tried to resell the clock to the store, the store bought it back at 50 percent of what the collector had paid. The shop then sold the clock again at a profit of 80 percent on its buy-back price. If the difference between the clock's original cost to the shop and the clock's buy-back price was $100, for how much did the shop sell the clock the second time?
$270
$250
$240
$220
$200
When I saw this question I started with the original cost of item as 100 and then worked all the way to 108 and then realized the values I have chosen does not represent the question because of $100 difference.
My question - when I see a question, should I first read the question completely and then start working on the question or start working from the first sentence the way I did what is the fastest way to solve something like this. Would really like some idea
OA is A
$270
$250
$240
$220
$200
When I saw this question I started with the original cost of item as 100 and then worked all the way to 108 and then realized the values I have chosen does not represent the question because of $100 difference.
My question - when I see a question, should I first read the question completely and then start working on the question or start working from the first sentence the way I did what is the fastest way to solve something like this. Would really like some idea
OA is A
) and arrive at the correct solution. 
