A married couple opened a savings account. The wife committed to saving $100 every week while the husband committed to saving $225 every month. After 4 months of savings, they decided to invest half of their money in buying stocks. Each share of stocks costs $50. How many shares of stocks can they buy? Let's be accurate as possible.
The wife saves $100 / week x 4 weeks / month = $400 a month. Together, the wife and husband save $400 / month + $225 / month = $625 / month. In 4 months, their total savings is $625 / month x 4 months = $2500. They are going to invest $2500 / 2 = $1250. So, they can buy $1250 / $50 / share = 25 shares of stocks.
The answer: 25.