Records were kept of the total costs for two months. The variable cost per unit stayed unchanged. In July, the total fixed costs were $\$1000$ higher. June: $8000$ units were produced, and total costs were $\$76\,000$ July: $10\,000$ units were produced, and total costs were $\$86\,000$ What was the amount of the fixed costs in July?
- A$31\,000$
- B$36\,000$
- C$41\,000$
- D$76\,000$