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標題:

問maths.

發問:

Find the percentage increase or decrease in each of the following.a)15 increases to 20 b)10 increases to 11 c)8 increases to22 d)12decreases to 8 e)16 decreases to 10 f)25 decreases to 14.25Find the new value for each of the following.a)20 hour increases by 12.5% ... 顯示更多 Find the percentage increase or decrease in each of the following. a)15 increases to 20 b)10 increases to 11 c)8 increases to22 d)12decreases to 8 e)16 decreases to 10 f)25 decreases to 14.25 Find the new value for each of the following. a)20 hour increases by 12.5% b)100度 increases by 6.5% c)$300 increases by200% d)32 days increases by 150% e)60m increases by 33 1/3% f)120ml increases by 66 2/3%

最佳解答:

Find the percentage increase or decrease in each of the following. a)15 increases to 20 (20 – 15) x 100% / 15 = 33.3% b)10 increases to 11 (11 – 10) x 100% / 10 = 10% c)8 increases to22 (22 – 8) x 100% / 8 = 175% d)12decreases to 8 (12 – 8) x 100% / 12 = 33.3% e)16 decreases to 10 (16 – 10) x 100% / 16 = 37.5% f)25 decreases to 14.25 (25 – 14.25) x 100% / 25 = 43% Find the new value for each of the following. a)20 hour increases by 12.5% 20(1+12.5%) = 22.5 hour b)100度 increases by 6.5% 100(1+6.5%) = 106.5度 c)$300 increases by200% $300(1+200%) = $900 d)32 days increases by 150% 32(1+150%) = 80days e)60m increases by 33 1/3% 60x(1+33 1/3%) = 80m f)120ml increases by 66 2/3% 120x(1 + 66 2/3%) = 200ml