標題:
Math~Pls help~
發問:
Please show the solution, steps and answer.Thank you~^V^Q1I bought 80 T-shirts and some pants from a shop. I paid $50 for each T-shirt and $180 for each pant. I sold all T-shirts at a profit of 30% and all pants at a loss of 15%. The overall loss I got after selling 80 T-shirts and all pants was $906. Find the... 顯示更多 Please show the solution, steps and answer.Thank you~^V^ Q1 I bought 80 T-shirts and some pants from a shop. I paid $50 for each T-shirt and $180 for each pant. I sold all T-shirts at a profit of 30% and all pants at a loss of 15%. The overall loss I got after selling 80 T-shirts and all pants was $906. Find the number of pants I bought. Q2 Mr. Lee mixed 420 ml of alcohol with water. If the volume of alcohol is 56% of the mixture, find the volume of water in the mixture. Q3 Tony made an investment of $18 000 and got a total of $22 500 last month. If he wanted to earn $6800 originally, how much should he invest last month? Q4 The temperature of a city has changed by +28% in the morning to 32°C at noon. Then its temperature has changed by -37.5% until mid-night. Q5 A merchant bought 140 eggs at $0.3 each. Later, he found that 25% of them are broken. He then sold the rest at $0.35 each. Find the profit/loss percentage by selling the eggs. Q6 A hawker bought 210 oranges at $4 each and 140 apples at $5 each. He sold all the oranges with a loss of 5%. What profit percentage should he sell the apples so that the profit/loss is zero? Q7 The selling price of a birthday cake is $108 after a $42 discount is given. a) Find the discount percentage of the cake. b) If the cake is sold with a 5% discount, find the selling price. Q8 A tin of corn is sold at 25% off. If Mrs. Chiu pays $50 for 5 tins and gets the change of $27.5, find the marked price of a tin of corn. Q9 The marked price of a sofa is $3000. If the sofa is sold at 26% off, then a merchant can still make a profit of 48%. a) Find the selling price of the sofa. b) Find the cost of the sofa. Please help me~I need to hand in on Wednesday. ><
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最佳解答:
Q1 Let P be the number of pants bought cost = 80(50) + 180P selling price = 80(50)(1+30%) + 180P(1-15%) thus, [80(50)(1+30%) + 180P(1-15%)] - [80(50) + 180P] = 906 Q2 Let W be the volume of water volume of alcohol : volume of mixture => 420 : 420+W = 56% : 100% Q3 Let I be the investment he made to earn $6800 22500 : 18000 = I+6800 : I Q4 Let M and N be the temperature in the morning and mid-night respectively M (1+28%) = 32 M (1-37.5%) = N Q5 Cost = 140 x 0.3 = 42 Selling = 140(1-25%) x 0.35 = A % change = 100% x (A-42)/42 Q6 cost = 210(4) + 140(5) selling price = 210(4)(1-5%) + 140(5)(1+P%) thus, 210(4)(1-5%) + 140(5)(1+P%) = 210(4) + 140(5) Q7 a) original price, 108+42 = 150 150 x (1-D%) = 108 b) 150 x (1-5%) Q8 selling price = (50-27.5)/5 = 4.5 per tin marked price: m (1-25%) = 4.5 Q9 a) selling price = $3000 x (1-26%) b) cost x (1+48%) = selling price = 3000 x (1-26%)
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