Answer:
The annual effective interest rate based on a 360 day period is 12.67%
Explanation:
The effective interest rate for a 180 day borrowing period is the ratio of net interest cost to net available proceeds.
The net interest cost = the gross interest cost - the incremental interest revenue.
The gross interest cost = $2,000,000 × 12% × (6 months ÷ 12 months) = $2,000,000 × 0.12 × 0.5 = $120,000
the incremental interest revenue = $200,000 × 6% × (6 months ÷ 12 months) = $200,000 × 0.06 × 0.5= $6,000
Since the net interest cost = the gross interest cost - the incremental interest revenue
Net interest cost = $120,000 - $6,000 = $114,000
net available proceeds = $2000000 - $200000 = $1800000
Therefore, the effective interest rate based om a 180 day period = net interest cost/net available proceeds = $114,000 / $1,800,000 = 0.0633 = 6.33%
The annual effective interest rate based on a 360 day period = 6.33% × 2 = 12.67%