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talaangoshtari
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Price if purchased by March 1 = 140.
Price if purchased between March 1 and March 15 = 168.
Since the price on March 2 = 168, while the price on March 1 = 140, we get:
x = percent increase from 140 to 168 = (168-140)/140 * 100 = (28/14) * 10 = 2*10 = 20.
Price if purchased on March 2 = 168.
Price if purchased between March 15 and March 31 = 210.
Since the price on March 2 = 168, while the price on March 16 = 210, we get:
y = percent increase from 168 to 210 = (210-168)/168 * 100 = (42/168) * 100 = (1/4)(100) = 25.
Thus:
y-x = 25-20 = 5.
The correct answer is A.
