Fill in the blanks. (i) If Nikita travels 252km in 12 hours then she travels P km in 21 hours (ii) if cost price of 5 chairs and 6 tables is Rs.750 and Rs. 3600 respectively, then cost price of 3 such chairs and 2 such tables is Rs. Q. (iii) The ratio of the number of boys to total number of students in a class is R, if the number of boys and girls are 36 and 18 respectively.

• A. P Q R 400     1680      \[2:3\]       
• B. P Q R 325     2650      \[3:2\]       
• C. P Q R 441     1650      \[2:3\]       
• D. P Q R 441     3280      \[3:4\]