Question

By selling 5 Pens, a person gets profit equal to selling Price of 2 Pens. What is the
profit percentage ?​

Answer 1

Answer:

Let the cost price (CP) of five pen be x.

Hence, cost price of one pen is x/5

The sale price (SP) of 4 pen is x

Hence, sale price of one pen is x/4

Profit on one pen = sale price - cost price

Profit = x/4 - x/5

Profit = (5x - 4x)/20

Profit = x/20

Profit percentage = profit/cost price × 100

= (x/20)/(x/5) × 100

= x/20 × 5/x × 100

= 100/4

= 25%

Answer 2

Answer:

Explanation:

Here in this question, we are given with a circuit made by Ranjit with a cell holder, a switch and bulb. But, the bulb didn't glow and we have to find the possible reason for this. But before that,

A circuit is a closed path made with several electrical elements like wire, a source, an appliance, a switch etc. The electrons carrying the negative charges flow inside the circuit and hence we can say that current is flowing which glows the bulb like in this case.

Possible reasons:

(a) Connection of wires may be loose.

This might be a possible reason because the wire if not attached tightly will lead to disturbance in the flow of current inside the circuit. So, this is correct✓

(b) Cells may be damaged.

The cells may not have any source or electrolyte remaining to change chemical energy into electrical energy. Dry cells generally are short-termed. So, this is correct✓

(c) Bulb may be fused.

Ranjit might not have realized that the filament of the bulb is broken and hence the bulb is fused. The circuit will break here and the bulb will not glow. So, this is also correct✓.

So, we can see here that all the first three options are given and the fourth option is All of these, which is correct since a, b and c is correct. Hence, the correct option is:

\huge{ \boxed{ \bold{ \sf{ \red{Option \: D}}}}}OptionD

And we are done !!