At the start of the year, a manufacturer’s work in progress had a value of $\$850$. By the end of the year, this had risen to $\$10\,200$. What effect did this rise have on the cost of production and the cost of sales?
- Acost of production: decrease; cost of sales: decrease
- Bcost of production: decrease; cost of sales: increase
- Ccost of production: increase; cost of sales: decrease
- Dcost of production: increase; cost of sales: increase