বিগত সালের প্রশ্ন ও প্রশ্ন ব্যাংক
বিসিএস, ব্যাংক, প্রাথমিক শিক্ষক ও সকল সরকারি চাকরির বিগত সালের প্রশ্ন ও অধ্যায়ভিত্তিক নির্ভুল সমাধান
Solution:
At 20% loss,
Selling price Tk. 80 when cost price Tk. 100
Selling price Tk. 1 when cost price Tk. 100/80
Selling price Tk. 4000 when cost price Tk. (100 × 4000)/80
= Tk. 5000
At 15% profit,
cost price Tk. 100 when selling price Tk. 115
cost price Tk. 1 when selling price Tk. 115/100
cost price Tk. 5000 when selling price Tk. (115 × 5000)/100
= Tk. 5750
At 8% discount,
Selling price Tk. 92 when marked price Tk. 100
Selling price Tk. 1 when marked price Tk. 100/92
Selling price Tk. 5750 when marked price Tk. (100 × 5750)/92 = Tk. 6250
Solution:
Total score on 4 tests = 80 × 4 = 320
Total score on 5 tests = 84 × 5 = 420
The score in the fifth test is = 420 - 320 = 100 or 100%
Solution:
55% of 12/66 of 270
= (55/100) × (12/66) × 270
= 27
Solution:
Percentage = (3/4)/(1/2) × 100
= (3/4) × (2/1) × 100
= (3/2) × 100
= 150%
Therefore, 12/16 is 150% of 1/2.
Solution:
A dress on sale in a shop is marked at Tk. Z
After 15% discount the price is = Z - 15% of Z = Z - 0.15Z = 0.85Z
For staff member, further 10% reduction the final price will be = 0.85Z - 10% of 0.85Z = 0.85Z - 0.085Z = 0.765Z
Solution:
Decrease = 25 - 21 = 4
Percentage of decrease = (4/25) × 100% = 16%
Solution:
Let,
The cost price of coat = x
ATQ,
150% of x = 75
⇒ (150/100) × x = 75
⇒ x = (75 × 100)/150
∴ x = 50
Solution:
Defective machine in 1st shipment = 5% of 120 = 6
Defective machine in 2nd shipment = 10% of 80 = 8
Total Defective machine = (6 + 8) = 14
Percentage of combined defective machine = (14/200) × 100% = 7%