Maths Questions

percentage of students getting 'A' in the exam
=(12 / 120) * 100%
=10%

2007-04-06 18:16:38 補充：
2a. Let X be the number of calendars,[(2/5*X)*$18] [(3/5*X)*$(18-10)] = $3000(36/5*X) (24/5*X) = $300060/5*X = $3000X = $3000/12X = 250The total number of calendars he has originally is 250.

2007-04-06 18:23:31 補充：
2b. Profit:(100*$18) (100*$8) = 1800 800 = $2600$2600 = total cost * 20%$2600/20% = total cost total cost = $13000total cost per calendars: $13000/ 250=$52Hope can help u ^^

2007-04-06 18:24:11 補充：
2b. Profit:(100*$18) (100*$8) = 1800 800 = $2600$2600 = total cost * 20%$2600/20% = total cost total cost = $13000total cost per calendars: $13000/ 250=$52Hope can help u ^^

2007-04-06 18:26:13 補充：
2b. Profit:(100*$18)加(100*$8) = 1800加800 = $2600$2600 = total cost * 20%$2600/20% = total cost total cost = $13000total cost per calendars: $13000/ 250=$52Hope can help u ^^p.s. 唔知點解出唔到"加"號