can someone walk me step by step how i can solve this? Ted Nash must pay $1,600 in interest on a promissory note for $40,000 due 4 months from the date of the note. Find the rate of interest he will pay. thanks!

Unaware that 35% of the 10000 voters in his constituency support him, a politician decides to estimate his political strength. a sample of 200 voters shows that 40% support him. a. what is the population? b. what is the parameter of interest? state its value c. what is the statistics of the interest? state its value d. compare your answers in (b) and (c) is it surprising they are different? if the politician were to sample another 200 voters, which of the two numbers would most likely change? explain