In physics lab, your lab partners Tracey and Nadia arrange a set of three different lightbulbs (resistors) R₁, R₂ and R₃ in a parallel arrangement shown in the circuit below. The circuit also has an ammeter, a voltage source of 45 V and a switch After the switch closes, the ammeter registers 4 A. The lab instruction manual only provides the relative values of the resistances R₂ = 2R₁ and R₃ = 4R₁. Help your partners determine the resistance R₁ (?). Give answer to two places to the right of the decimal.