) Jonathan’s weekly pay this year is £960. This is 20% more than his weekly pay last year.
Tess says “This means Jonathan’s weekly pay last year was £768”.
Tess is wrong.
a) Explain why
b) Work out Jonathan’s weekly pay last year.

800 euros

Step-by-step explanation:

First, let's start by finding Jonathan's weekly pay

So, we know that 960 euros is (120/100) times the pay that he got last year.

So we multiply 960 by the reciprocal of 120/100 which is 100/120 or simplified to 5/6.  960*5 = 4800.  4800/6=800.

So Jonathan's weekly pay was 800 euros last year.

Tess is wrong because she multiplied 960 by 4/5 because she thought this meant that Jonathan got paid 4/5 of what he gets per week this year which is what she thinks he got paid last year. You are supposed to multiply it by 6/5 rather than 4/5 because 20 percent more than 100 is 6/5 rather than 4/5.

a

step-by-step explanation: