Question

A shopkeeper buys 1,800 eggs at 36 baht per dozen. 5% of the eggs are rotten. Find the selling price of each egg if he wants to earn a 42.5% profit on the cost price.​

Answer 1

Answer:

10000 eggs

Steps of construction:

Step I - Draw a line segment AB = 7 cm with the help ruler.

Step II - with vertex A, by using compass take more than half of AB and draw arcs, one each side of AB.

Step III - with vertex B, by using compass with same length, cut the previous arcs at X and Y respectively.

Step IV - with help of ruler join the point X and Y Thus XY is the perpendicular bisector of line AB.

solution

Answer 2

Answer:

Cost of one egg =

12

16

=

3

4

=1.33

Total cost = 50×16=800

Remaining eggs = (50×12)−20

=600−20

=580

Total sellings = 580×

2

3

=290×3

=870

⇒ profit =

800

870−800

×100

=

800

70

×100=8.75%