The height of a triangle is increased by
10%. To retain the original area of the
triangle, its corresponding base must be
decreased by ?
A. 9$1\over8$%
B. 9$1\over7$%
C. 9$1\over11$%
D. 10%

A man bought a watch at 25% discount on
the original price. He got ` 40 more than
the original price by selling it at 140% of
the price at which he bought. The price of
buying the watch was ?