Calculate the simple interest on a $100,000 investment at an

interest rate of 12 percent a year after 6 months.

To calculate the simple interest, we use the formula:

Simple Interest = Principal x Rate x Time

Given:
Principal = $100,000
Rate = 12% = 0.12 (in decimal form)
Time = 6 months = 0.5 years

Simple Interest = $100,000 x 0.12 x 0.5
= $6000

Therefore, the simple interest on a $100,000 investment at a 12% interest rate for 6 months is $6,000.