hi, could anyone help me these questions

Answer:
1. £123120
2. £13.69
3.
4. £1200
5. £105
Step-by-step explanation:
1. 108000 multiplied by 114% = 123120
2. 18.5 multiplied by 1-0.26 = 13.69
3.
4. x (1.65) = 1980
x=1200
5. 113.4 = 1.08x
x= 105
I don't know about #3