According to the interest rate theory higher price level will lead to following chain of events in the short run: Marginal propensity to save will decrease(ratio of spending/saving will change, people will spend relatively more compared with saving) => savings will decrease => less money will become available for lending => the interest rate will increase => firms will spend less because loans became more expensive. Or in other words, higher price level => more expensive loans for firms.
BUT, we also know that the real interest rate equals the nominal interest rate minus the inflation rate. Higher inflation would decrease the real interest rate. Wouldn't lower real interest rate make borrowing money less expensive for firms?
P.S. Why is my question being downvoted? Please, provide feedback so I could improve it. I can't read minds.