Brad buys a pack of 12 bottles of energy drink for £9.25 He then sells all 12 bottles for £1 each.
Work out Brad's percentage profit.
Give your answer correct to 2 significant figures.​

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is:

the correct answer is 1.7