Using long division what is the quotient of this expression?

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,

Kevin's bank offered him a 4.5% interest rate for his mortgage. if he purchases 3 points, what will be his new rate?