A man goes into a hardware store to purchase some knobs. To purchase one knob you must pay a minimum of 4 U.S. coins. Two knobs can be purchased with a minimum of 6 U.S. coins. 3 knobs require a minimum of 2 U.S. coins. How much does one knob cost?
U.S. coins include: a penny ($.01), a nickel ($.05), a dime ($.10), a quarter ($.25), a half-dollar ($.50), and a silver dollar ($1.00).
Answer
One knob costs $0.17
