Ryan buys some jumpers to sell on a stall. He spends £120 buying 60 jumpers.
He sells 80% of the jumpers for £8 each.
He then puts the rest of the jumpers on a Buy one get one half price offer.
He manages to sell half the remaining jumpers using this offer.
How much profit does Ryan make?

£312

Step-by-step explanation:

Amount spent on 60 jumpers = £120

80% of the jumpers :

0.8 * 60 = 48 jumpers

Sales price for 80% = £8 each

Total = £8 * 48 = £384

The remain at an half price offer :

Half price = £8 / 2 = £4

£4 * (60 - 48)

£4 * 12 = £48

Total sales revenue = £(48 + 384) = £432

Total profit made :

Total sales revenue - purchase price

£432 - £120

= £312

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i