NET Natural Sciences MCQs

He charges for 1,000 grams but supplies only 900 grams.
Gain percentage is 100/900 × 100 = 11 1/9%.

The selling price is 80% of the marked price.
Thus, marked price = 960 ÷ 0.80 = Rs. 1,200.

Sales tax is 12% of Rs. 5,000, or Rs. 600.
The total payable amount is Rs. 5,600.

Commission is 6% of total sales.
Thus, 0.06 × 250,000 = Rs. 15,000.

The taxed price is 115% of the original price.
So the original is 2,300 ÷ 1.15 = Rs. 2,000.

Using SI = PRT/100, 900 = P × 6 × 3/100.
Solving gives P = Rs. 5,000.

Rate = SI × 100 ÷ (P × T).
Thus, 800 × 100 ÷ (4,000 × 5) = 4%.

Compound amount is P(1 + r)².
Thus, 10,000 × 1.1² = Rs. 12,100.

The amount is 8,000 × 1.05² = Rs. 8,820.
Subtracting the principal gives compound interest of Rs. 820.

Six consecutive integers centered at 17.5 are 15 through 20.
Therefore, the smallest is 15.

For two years, the difference is P(r/100)².
So 10,000 × 0.1² = Rs. 100.

The average of 1 through n is (n + 1)/2.
Setting (n + 1)/2 = 20 gives n = 39.