Note Cal Poly SLO uses 9-11th grades with a 8 semester cap for the approved Honor eligible courses.
SLO admit rate for Econ is estimated at 19% with a 25th-75th percentile SLO GPA of 4.08-4.25.
For the UC”s here are some admit rates for Economics:
UC Berkeley: 5.3% High Demand major
UC Davis. Does not admit by major but by College: 37.9% for Economics
UCI: 17.5% Economics/ Business Economics: 10.8%
UCLA: Does not admit by major but by College: Economics 11%
UC Merced: 78%
UC Riverside: 62%
UC San Diego: Estimated <25% Economics
UC Santa Barbara: Does not admit by major but by College: 32% for Economics (pre)
UC Santa Cruz: 44.7%
Good luck.