10. At the beginning of a 30-day month, Buttercup Dickerson owned a portfolio valued at $5.000. On day 10, Buttercup's portfolio was worth $7,300 after a $2,000 contribution had been made on that day. At the end of the month, the portfolio was worth $9,690.18. Calculate both the time-weighted and dollar-weighted returns on Buttercup's portfolio for the month. Why do the two returns differ so substantially?