'A person|'s salary is decreased by steps of 20%, 15% and 10%. Approximately

"A person\'s salary is
decreased by steps of 20%, 15% and 10%. Approximately by what percent should
the reduced salary be increased so as to get back the original salary?
`39 %`
b. `44 %`
c. `56 %`
d. `63 %`"

Approximately