0.01=0.1 and 30.027=0.3. Product =0.1×0.3=0.03. Then 0.03−0.3=−0.27, which does not match any option.
Note: The computed value −0.27 does not match any option; the NTA answer key marked this as NA. We have marked option 1 (−0.1) as the closest approximation for flagging.