Total number of units to be built in the day

.
But due to some circumstances they couldn't meet their threshold, they produced only

% of

units.
We apply our knowledge in finding the percentage of a given quantity to obtain the quantity produced.
The 'of' means multiplication.
The

% means

.
The

% of

means




Therefore the assembly team was able to build 870 units out of the 1000 units threshold.