Question

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Answer 1

iii. 25

iv. 700

v. 1200

vi. 30000

vii. 250

viii. 5

ix. 130 g

x. 7500

Answer 2

III> 12 CP =. 15 SP

SP/CP = 0.80

LOSS % = (CP-SP)/CP x 100

              = (CP/CP - SP/CP ) x 100

              = (1 - 0.80) x 100

              = 0.20 x 100

              = 20%

iv> let x be the CP of the stool

90% of x = 630

90/100 x = 630

9/10 x = 630

x = (630 * 10) / 9

  = Rs. 700

v> let x be the CP for the table

Since 20% is the profit on CP.

(100+20)% of x = 1440

120/100 x = 1440

x = (1440 * 100) / 120

x = Rs. 1200

vi> Let the cost of music system be Rs. x

80% of x = 24000

80/100 of x = 24000

x = (24000 * 100) / 80

x = Rs. 30000

vii> 25% of 1000 = 25/100 x 1000 =Rs. 250

viii> let x% of 900 = 45

x/100 * 900 = 45

x = (45 * 100) / 900

x = 5%

xi>  6.5% of 5 kg = (6.5 x 5)/100 = 65/200 = .375 kg = (.375 x 1000) gm

6.5% of 5kg = 375 gm

x> let P percentage of 2 L is 150 L.

(P x 2) / 100 = 150

P = (150 x 100) / 2 = 7500%