8. How much does the dress cost? The worker's monthly pay, that is, for thirty days, is ten dinars and a dress. He worked for three days and earned the dress. What is the cost of the dress?
8. Since for 30 days he will receive 10 dinars and a dress, then for 3 days he will receive a dinar and $\frac{1}{10}$ of a dress, therefore, the dress costs $1 \frac{1}{9}$ dinars. One can reason differently: since he earned a dress in three days, then in 27 days he should have received 10 dinars, and in 3 days accordingly $1 \frac{1}{9}$ dinars.