In these days of inflation (1)/a ten rupees note will not buy you (2)/ even an ordinary meal. (3)/ No error (4)

Answer

2

Explanation

The structure for the use of such terms is as follows:
a ten-rupee note (right)
a ten rupee note (wrong)
a five-rupee note (right)
a five-mile walk (right)
a two-day leave
(right)
Here, ten rupees is a Compound Adj. So, hyphen must be used between ten and rupee `rarr` ten-rupee and rupees will also be replaced by rupee (Singular)
Hence, a ten-rupee note will not buy you is the right usage.