Table:
text: 1975 PGA Tour
Tournament results
Tournament results
Date_ Tournament Location_ Winner Score _1st_prize_
Apr 27 Tallahassee Open Florida Rik Massengale (1) 274 (–14) 12000
May 4 Houston Open Texas Bruce Crampton (14) 273 (–15) 30000
May 12 Byron Nelson Golf Classic Texas Tom Watson (2) 269 (–19) 35000
May 18 First NBC New Orleans Open Louisiana Billy Casper (51) 271 (–17) 30000
May 25 Danny Thomas Memphis Classic Tennessee Gene Littler (27) 270 (–18) 35000
Jun 1 Atlanta Classic Georgia Hale Irwin (4) 271 (–17) 45000
Jun 8 Kemper Open North Carolina Raymond Floyd (6) 278 (–10) 50000
Jun 15 IVB-Philadelphia Golf Classic Pennsylvania Tom Jenkins (1) 275 (–9) 30000
Jun 23 U.S. Open Illinois Lou Graham (3) 287 (+3) 40000

Question: What is 1st prize at the US Open under the 1975 PGA Tour?