Two bonds funds pay interest at rates that differ by 1%. money invested for one year and the first fund earns $280 interest. the same amount invested in the other funds earns $315.
find the lower rate of interest

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236