Money Word Problem • A phone has 50% off. It was £60 – what is the new price?
• There is 10% off all sofas. The Smiths are going to buy the one priced
at £800. How much money will they get off? What will the new price
be?
You'll get 50 points if you help answer please help!

With #! i’ve tried to figure it out but i can’t.

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

Ken earned $128 from his part-time job this summer. he spent 25% of his money on games. he is going to donate 1/6 of the remaining money to charity. how much money will the charity receive?