Spending $1000 from a savings account paying 4 percent of interest a year means a opportunity cost of how much money a year? A. $80
B. $40
C. $20
D. $10

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Dakota earned $7.50 in interest in account a and $18.75 in interest in account b after 15 months. if the simple interest rate is 4% for account a and 5% for account b, which account has the greater principal? explain. to make it a little easier, there is an image. good luck!

For what value of (y) is 3^3/3^y =1/9