Class 12th

Month = C3/Total Sales*100

January $\frac{75}{550}*100=13.6\mathrm{\%}$

February $\frac{75}{500}*100=15\mathrm{\%}$

March $\frac{100}{700}*100=14.28\mathrm{\%}$

April $\frac{100}{800}*100=12.5\mathrm{\%}$

May $\frac{50}{450}*100=11.11\mathrm{\%}$

June $\frac{75}{650}*100=11.53\mathrm{\%}$

Month = C1/Total Sales * 100

January $\left(\frac{175}{550}\right)*100=31.31\mathrm{\%}$

February $\left(\frac{150}{500}\right)*100=30\mathrm{\%}$

March $\left(\frac{225}{700}\right)*100=32.14\mathrm{\%}$

April $\left(\frac{250}{800}\right)*100=31.25\mathrm{\%}$

May $\left(\frac{150}{450}\right)*100=33.33\mathrm{\%}$

June $\left(\frac{200}{650}\right)*100=30.7\mathrm{\%}$

No month have sales more than 33.33%. Hence option (d)

Month = C3/ (C2+C4)

January $\left(\frac{75}{100+200}\right)=25\mathrm{\%}$

February $\left(\frac{75}{100+175}\right)=27.27\mathrm{\%}$

March $\left(\frac{100}{125+250}\right)=26.66\mathrm{\%}$

April $\left(\frac{100}{150+300}\right)=22.22\mathrm{\%}$

May $\frac{50}{75+175}=20\mathrm{\%}$

June $\frac{75}{100+275}=20\mathrm{\%}$

Hence, the required percentage was the most in the month of February.

Required Ratio

 = Increase in R4/ Increase in R3

$=\frac{2046}{2028}=1$

$Ratio=\frac{\frac{2.1}{100}*2400}{\frac{17}{100}*10200}=0.29$

R3$=\frac{26}{100}*10200-\frac{26}{100}*2400=2028$

R4 $=\frac{25}{100}*10200-\frac{26}{100}*2400=2046$

R5 $=\frac{24*10200}{100}-\frac{26*2400}{100}=1812$

Percentage change in R2 Sales

$=\left(\frac{\left(\frac{8*10200}{100}\right)-\left(\frac{12*2400}{100}\right)}{\left(\frac{12*2400}{100}\right)}\right)*100=183\mathrm{\%}$

Total votes in 2009 = (2.24/44.8)*100=5 crore

Total Votes in 1999 = (1.228/30.7)*100= 4 crore

4 cr. is 20% less than 5 cr.

Total admission for each course:

Course 2 = 40 + 80 + 95 + 100 + 110 + 130 = 555,

Course 5 = 100 + 140 + 180 + 200 + 250 + 300 = 234,

Course 4 = 14 + 18 + 10 + 6 + 12 + 16 = 1170,

Course 3 = 80 + 120 + 120 + 110 + 150 + 130 = 710.