The task is to generate the correct answer for a given math problem.

[Q]: Problem: 6 ) a marketing firm determined that , of 260 households surveyed , 80 used neither brand a nor brand b soap . 60 used only brand a soap and for every household that used both brands of soap , 3 used only brand b soap . how many of the 200 household surveyed used both brands of soap ?
[A]: c ) 30


[Q]: Problem: find the principle on a certain sum of money at 9 % per annum for 2 2 / 5 years if the amount being rs . 1120 ?
[A]: 921.0


[Q]: Problem: the cost price of a radio is rs . 3300 and it was sold for rs . 1230 , find the loss % ?
[A]:
62.7 %