Shabana bought 16 dozen ball bens and sold them at a loss equal to S.P. of 8 ball pens. Find (i) her loss percent (ii)`\ `S.P. of 1 dozen ball pens, if she purchased these 16 dozen ball pens for Rs 576.

Naresh bought 4 dozen pencils at Rs 10.80 a dozen and sold them for 80 paise each. Find his gain or loss percent.

Find the ratio of the price of pencil to that of ball pen, if pencil cost Rs.16 per score and ball pen cost Rs.8.40 per dozen.

Cost of a dozen pens is Rs 180 and cost of 8 ball pens is Rs 56. Find the ratio of the cost of a pen to the cost of a ball pen.

Neeru bought 1600 bananas at Rs 3.75 a dozen. She sold 900 of them at 2 for Re 1 and the remaining at 5 for Rs 2. Find her gain or loss percent.

A shopkeeper purchased one dozen pens for Rs. 108 and sold these at Rs. 12.50 each. find: (i) the cost of one pen. (ii) profit or loss on selling one pen. (iii) his total profit or loss onselling all pens.

A ball of mass 20 g falls from a height of 10 m and after striking the ground.It rebounds from the ground to a height of 8 m . (a) Calculate: (i)The kinetic energy of the ball just before striking the ground ,and (ii)The loss in kinetic energy of the ball on striking the ground,and (ii)the loss in kinetic energy of the ball on striking the ground. (b)What happens to the loss in kinetic energy in part(ii) ? Take g=10 m s^(-2) Neglect air friction .

Three shopkeepers A ,\ B\ a n d\ C go to a store to buy stationary. A purchases 12 dozen notebooks, 5 dozen pens and 6 dozen pencils. B purchases 10 dozen notebooks, 6 dozen pens and 7 dozen pencils. C purchases 11 dozen notebooks, 13 dozen pens and 8 dozen pencils. A notebook costs 40 paise, a pen costs Rs. 1.25 and a pencil costs 35 paise. Use matrix multiplication to calculate each individuals bill.

Find the gain or loss percent, if (i) C.P=Rs 500 and S.P.= Rs 565 (ii) C.P=Rs 700 and S.P.=Rs 630

Karim bought 150 dozens pencils at Rs 10 a dozen. His overhead expenses were Rs 100. He sold them at Rs 1.20 each. What was his profit or loss percent?

Subramaniam bought 100 eggs for Rs 50. Out of these, 4 eggs were found to be broken. He sold the remaining eggs at the rate of Rs 8.50 per dozen. Find the gain or loss percent.