Calculate Mary$$s earnings for $31$ October $2023$ using the straight piecework wage incentive

INFORMATION

Mary is employed by Menton Manufacturers to sew dresses. The standard time to sew one dress is $40$ minutes. She is paid R$120$ per hour and the normal working time is $8$ hours per day. If she sews more than her quota, she receives $1\mathrm{.}5$ times the hourly rate on the additional output. On $31$ October $2023$ she sewed $18$ dresses