Question

1) Rehana sold a book for rupees 450 and had a loss of rupees 150 find its cost price and loss percent ?
2) determine the mean proportion between 1 and 9
3) solve the following
i) (-12 ) × 10 (-1)
ii) (-72) ÷ (-9)​

Answer 1

Step-by-step explanation:

1)cost price=loss+selling price & loss percent = 25

2) mean proportion = 9+1/2 =10/2=5

3) 1]-12 × -10 =120

2]-72 ÷ -9 = -72 × 1/-9 = -72/-9 = 8

Answer 2

Answer:

Q1) 25 per cent

Q2) 3

Q3) (i) 120

(ii) 8

Step-by-step explanation:

1) Selling price = Rs 450

Loss = Rs 150

Cost price = Selling price + loss

= 450 + 150 = Rs 600

Loss percent = Loss / C. P. × 100

= 150/600 × 100

Loss percent = 25 per cent

Q2) 1/x = x/9

By cross multiplication, we get

x² = 9

x = root over 9

x = 3

Hence, the mean proportion between 1 and 9 is 3.

Q3)

i) - 12 × 10(- 1)

= (- 12) × (-10)

= 120

ii) (- 72) / (-9)

= 8

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