Page 14: a) 8% increase Formula used: Effective Net Change = x + y + (xy/100) Where, x = first increase percent y = second decrement percent
Calculation: According to the formula, we have Effective successive increase = [20 - 10 + {(20 × -10)/100}]% ⇒ (10 - 2)% ⇒ 8% ∴ The price of petrol is increased by 8%
Page 14: a) 8% increase
ReplyDeleteFormula used: Effective Net Change = x + y + (xy/100)
Where,
x = first increase percent
y = second decrement percent
Calculation:
According to the formula, we have
Effective successive increase = [20 - 10 + {(20 × -10)/100}]%
⇒ (10 - 2)%
⇒ 8%
∴ The price of petrol is increased by 8%
Page 15: c) 50%
DeletePage 16: a) 16%
Page 20: c)
Delete