Railway RRB / NTPC - MCQ Practice Questions

To find the cost price when selling price and profit percentage are known, use the relationship: $\text{Selling Price}=\text{Cost Price}\times (1+\text{Profit\%}/100)$

Step 1: Set up the profit formula

When a shopkeeper makes a 25% profit, the selling price is 125% of the cost price.

Step 2: Express in terms of cost price

Step 3: Solve for cost price

Step 4: Calculate the final answer

Verification: If CP = Rs. 480, then profit = $600-480=120$, and profit% = $\frac{120}{480}\times 100=25\%$ ✓

Answer: The cost price was Rs. 480 (Option B)

3x + 5x = 80; 8x = 80; x = 10. Numbers are 30 and 50

SI = (P × R × T)/100 = (5000 × 8 × 3)/100 = 1200

Time = 6.5 hours; Speed = $\frac{195}{6}$.5 = 30 km/h

35% of 2000 = 700; 20% of 700 = 140

x × 1.15 = 345; x = $\frac{345}{1}$.15 = 300

Sum = 22 × 5 = 110; 18 + 24 + 20 + 26 = 88; Fifth = 110 - 88 = 22

If milk is 5 parts and equals 40L, then 1 part = 8L; water (3 parts) = 24L