2- Calculate the average cost per share for a monthly investment in a mutual fund with different share prices: Over the last three months, share prices were $12, $15, and $18. Over the last three months, share prices were $20, $25, and $30. Over the last three months, share prices were $5, $7, and $6. Over the last three months, share prices were $50, $55, and $45. Over the last three months, share prices were $10, $10, and $10.