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!

Arepresentative from plan 1 wants to use the graph below to sell health plans for his company. how might the graph be redrawn to emphasize the difference between the cost per doctor visit for each of the three plans? the scale on the y-axis could be changed to 0–100. the scale on the y-axis could be changed to 25–40. the interval of the y-axis could be changed to count by 5s. the interval of the y-axis could be changed to count by 20s.