Question

A man purchased 100 kg of rice at Rs 15 per kg, le spent Rs 50 for transportation. He then sold all the nice at Rs 18.50 per kg. Calculate his profit or loss per cent
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Answer 1

1 kg cost price = 15

100kg cost price = 1500

spent on transportation= 50

so total cost = 1500+50 = 1550

selling price = 18.50 for 1 kg

for 100kg selling price = 18.50×100 = 1850

profit = 1850-1550=300rs

profit % = (300/1500)×100 = 100/5 = 20%

Answer 2

ANSWER

Let the tens digit of the required number be x and the units digit be y. Then,

x+y=12 .........(1)

Required Number = (10x+y).

Number obtained on reversing the digits = (10y+x).

Therefore,

(10y+x)−(10x+y)=18

9y−9x=18

y−x=2 ..........(2)

On adding (1) and (2), we get,

2y=14⟹y=7

Therefore,

x=5

Hence, the required number is 57.