Examples
the cost will also be singular.
The cost of this car is $10000.
also
The cost of these cars is $100000.
Yeah, you are absolutely right. but in gmat sometimes we got stuck just because we mess up things between plural and singular.so, it was in general that we use cost as singular or the other way around "costs" is always plural.
One eg---
New leaks caused by the torrential rain have damaged the historic Henson House, significantly compounding the effects of neglect, which already are a cost to the restoration fund of more than $70,000.
A. significantly compounding the effects of neglect, which already are a cost to the restoration fund of
B. significantly compounding the effects of neglect, which already cost the restoration fund
C. significantly compounding the effects of neglect, already the restoration fund costs of
D. significant in compounding the effects of neglect, and already costing to the restoration fund of
E. significant in compounding the effects of neglect, and already costs the restoration fund of
OA
B
Regards,
Sunny