WITHOUT CALCULATOR!!!!!
for 92% of 250
U knw tht
100% of 250= 250
10% of 250= 25
1% of 250= 2.5
0.1% of 250= 0.25
( jst shift zero as per percentage)
Now for 92%= 90% + 2 % of 250
i.e. 9x 10% + 2x 1%
= 9x25 + 2x 2.5
= 225 + 5
= 230
Similarly for 8.5% 0f 160
100% =160
10%=16
1%=1.6
0.1%=0.16
8.5% = 8x 1% + 5 x 0.1%
= 8 x 1.6 + 5 x 0.16
=13.6