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Microphone: Converts a sound wave into an electrical signal. Loudspeaker: Converts an electrical signal into sound waves. Headphone: Converts electrical energy into mechanical energy to produce sound. Amplifier: • It is used to change the amplitude of a signal. • The purpose of an amplifier is to produce an output signal larger than that of the input signal. • It is used to convert Direct current into Alternate Current.
A dishonest seller, at the time of selling and purchasing uses weight 10% less and 20% more per kg respectively. Find the approx. percent profit earned ...
A watch was sold with a 20% profit. The marked price of the watch over its cost price is Rs. 960. If the ratio of profit earned to discount offered is 1...
Find the cost price of the digital watch for the shopkeeper if he initially marked it at 80% above the cost price and later offered two successive disco...
The ratio of the cost price and marked price of an article is 5:9, respectively. The article is sold after giving a discount of Rs. 900 such that there ...
A shopkeeper purchased 70 kg of radish for Rs. 560 and sold the whole lot at the rate of Rs. 14 per kg. What will be his gain percent?
Marked price of an article is Rs.220 more than its cost price. If profit earned is equal to the discount given then find the profit earned?
A sells an article to B at a profit of 20% and B sells it to C at a profit of 20%. If C pays ₹504 for it, what was the cost price for A?
The difference between selling an item at an 18 percent loss and at a 14 percent profit is Rs. 1000. At what price should the item be sold to make a pr...
A person buys a piece of machinery for ₹60,000. After 1 year, he sells it at a 15% profit and reinvests the entire amount in a new machine. The second...
The ratio of the cost price to the marked price of an article is 3:5 and the ratio of the profit percentage to the discount percentage is 5:2. Find the...
