For a hypothetical campus-event shuttle service, demand is Q_D=120-2P_B and supply is Q_S=2P_S-20. A per-trip tax of 10 creates the wedge P_B-P_S=10. Find the price paid by riders, P_B, after tax.

Please enter a number only. If your answer is a decimal, round it to no more than two decimal places. Do not include spaces, commas, letters, or special characters such as dollar signs.