When visiting a previously undiscovered planet, the crew of the Enterprise would often send a team to scout out the terrain. This crew typically included either Captain Kirk or Lieutenant Spock or both. Suppose that the away team included Kirk 60% of the

time. The away team included Spock 70% of the time. Given that Spock was in the away team,

Kirk was also in the away team 80% of the time.

a) What percent of away teams included both Kirk and Spock?