Final answer:
Banks faced losses due to an actual inflation rate that was lower than expected, which resulted in a lower real interest rate than they had planned for, leading to a decrease in the real value of the money repaid to them.
Step-by-step explanation:
The question concerns the effect of real interest rates and inflation on banks. When a bank charges a nominal interest rate of 14%, with an expected inflation rate of 5%, but the actual real interest rate turns out to be 7%, this implies that the actual inflation rate was 7% (14% nominal rate - 7% real rate). Contrast this with the expected 17% nominal interest rate initially planned, assuming an expected inflation rate of 5%. The correct statement is that banks faced losses due to unanticipated inflation being lower than expected. Instead of the expected 5% inflation rate (which would have resulted in a 12% real interest rate with the planned 17% nominal rate), the actual inflation rate paired with the 14% nominal rate resulted in a 7% real interest rate.
Since the real interest rate is 7%, not the expected 12%, banks received less in real terms than they planned. There was no unanticipated inflation. Instead, the banks suffered losses because the real value of the money they loaned out is less than what they expected due to the lower actual inflation rate.