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Emma wants to buy a radio, the full price is £80. In the shop, she is given a discount. A year later, she sells the radio for £78, giving her a profit of 30% of what she bought it for the year before. What discount did she receive? (4)

Finding what Emma paid for her radio £78 / 1.3 = £60 (M1) (A1)

Finding what percentage of £80 that is £60 / £80 = 0.8 or 80% (M1)

Recognising the discount is 20% ie. 1-0.8=0.2 (A1)

Answered by Helena R. • Maths tutor

2771 Views

Explain the photoelectric effect, when does it occur and what is its significance in understanding the nature of light ? (6)

metal (unlike insulators ) contains free electrons (1)

kinetic energy transferred from the light incident on the surface to the free electrons (1)

The maximum kinetic energy of the electrons...

Answered by Helena R. • Physics tutor

1740 Views

In a class of 30, the ratio of boys to girls is 2 : 3 , how many girls are there?

If the ratio is 2 : 3 then in a class of 5 there would be 2 boys and 3 girls.

So we can say that 2/5 of the class are boys and 3/5 of the class are girls.

And we know that to calculate 3/5...

Answered by Rebecca E. • Maths tutor

44908 Views

How am I supposed to remember quotations for unseen texts?

Trying to remember quotations for the exam can be one of the trickiest aspects to English Literature at A-level. For my studies, I displayed bunting around my room with key quotations from all of the text...

Answered by Eleanor W. • English Literature tutor

3414 Views

What is the use of a web-server on the internet?

A webserver is a computer that has been set up to listen for incoming requests from a client, find appropriate data for that request and return a response to that client. This is similar to a 'chatbot' on...

Answered by Jack P. • Computing tutor

2356 Views