Explanation:
Number of tumblers the person bought=1000
Number of glass tumblers broken=100
Remaining unbroken glass tumblers =Difference of Number of glass tumblers broken from Number of tumblers the person bought=1000-100=900
Total SP=900×80=72000
As per the equation
CP = ( SP * 100 ) / ( 100 – percentage loss )
=72000×100/100-4
=7200000/96
=750000