 
<translate> Ɗaya daga cikin darussan yana da sa'o'i 1.5, don haka sa'o'i 18 daga cikinsu shine 18 / 1.5 = darussan 12. Idan darasi daya ya kai dala 30, to darasi 12 ya kai dala 12 * 30 = 360. Amsar ƙarshe: 360. <eng> One lesson lasts 1.5 hours, so 18 hours of them is 18 / 1.5 = 12 lessons. If one lesson costs $30, then 12 lessons cost 12 * 30 = $360.
The final answer: 360. 