Buying:
He bought #200 color(orange)(" oranges")#
for #₹120# per score
#1# score has #20 color(orange)(" oranges")#
So, he bought #200/20=10# scores of #color(orange)(" oranges")#
#color(red)("Total cost" = 10times120 = ₹1200 ->"CP"#
Selling:
He sold #=200-25 = 175 color(orange)(" oranges")#
#color(blue)("Total money he got" = 175times₹5=₹875->"SP"#
As #"CP" > "SP"#, he is at Loss.
#"Loss" = color(red)("CP"-color(blue)("SP")=1200-color(blue)
(875))=color(violet)(₹325#
#"Loss percent" = "Loss"/"CP"times100#
#= color(violet)(₹325)/ color(red)(₹1200)times 100#
#=27%#