20. Liam spent all his money buying 50 soda bottles at the corner shop for $£ 1$ each. He sold each bottle at the same higher price. After selling 40 bottles, he had $£ 10$ more than he started with. He then sold all the remaining bottles. How much money did Liam have once all the bottles were sold?
A $£ 70$
B $£ 75$
C $£ 80$
D $£ 90$
E $£ 100$
20. B Liam spent $50 \times £ 1=£ 50$ buying the bottles. After selling 40 bottles he had $£(50+10)=£ 60$. Therefore he sold each bottle for $£ 60 \div 40=£ 1.50$. Hence, after selling all 50 bottles, he then had $50 \times £ 1.50=£ 75$.