২২৪১১
An item is sold for taka 65, giving the retailer a profit of 30% of the cost. What will be the new retail price if the retailer cuts his profit to 10% costs?
উত্তর
55
সমাধান
At 30% profit,
130 tk the retail cost is 100 tk
1 tk the retail cost is 100/130 tk
65 tk the retail cost is ( 100×65)/130 = 50 Tk
At 10% out of cost profit
100 tk the sellling price is 110 tk
1 tk the selling price is 110/100 tk
50 tk the selling price is ( 110×50)/100 = 55 Tk.
২২৪১২
If taka 45000 was invested in a share when the price per share was taka 90 and taka 3000 was invested when the price per share was taka 60, what was the average price per share purchased?
উত্তর
87.27
সমাধান
Average price = (45000 + 300o) /(500 + 50) = 87.27
২২৪১৩
A cake is divided into 18 pieces.If Rehana takes 1/3 of the cake and Rahim takes 1/3 of the cake left , how many pieces are left?
উত্তর
8
সমাধান
After Rehana takes cake is left = 18/3 = 6
(18 - 6 = 12 pieces
After Rahim takes cake is keft = ( 12 - 12/3) = 8
২২৪১৪
A person wishes to accumulate taka 150,000 by the end of 15 years by making equal half -yearly deposits over the next 15 years. If he/she earns 10% on the investment , how much must he/she deposit at the end of each half year?
উত্তর
4545.4545
সমাধান
x + . 10x = 150000
x = 136363.6364
Half yearly capital = x÷30 = 4545.4545
২২৪১৬
How much interest will taka 2,000 earn at an annual interest rate of 8% in one year if the interest is compounded every six month?
উত্তর
332.80
সমাধান
C = x ( 1 + r)n
= 2000 ( 1 + . 08) 2
= 2332.80
interest = 2332.80 - 2000 = 332.80
২২৪১৭
The angles of triangle of a triangle are in the ratio 2: 3: 4. the largest angle in the triangle is:
উত্তর
80
সমাধান
Here, 2x + 3x + 4x + = 180
x = 20
4x = 80
২২৪১৮
A restaurant meal costs taka 35.50 and there was no tax. If the tip was more than 10% and less than 15% of the cost of the meal then the total amount paid must have been between --
উত্তর
Taka 39 and taka 41
সমাধান
35.50 ×. 10 + 35.50 = 39.05
35.50 ×. 15 + 35.50 = 40.825
২২৪১৯
In a school the ratio of boys to girls is 3 to 7. If the total student is 150 then how many boys are there?
উত্তর
45
সমাধান
Every 10 total person has 3 boys
Every 150 total person has = (3×150)/10 boys = 45 boys
২২৪২০
The population of a country doubled every 10 years from 1980 to 2010. What was the percent increase in population during this time.
উত্তর
800%