 
 <translate> The question Bill is trying to control the pests in his garden. Each spider he introduces eats 7 bugs, and each time he sprays the garden he reduces the total bug population to 80% of what it was previously. If the garden has 400 bugs to start, and Bill sprays once and introduces 12 spiders, how many bugs are left? <hau> Tambayar ita ce Bill yana kokarin sarrafa kwari a lambunsa. Kowane gizo-gizo da ya gabatar yana cin kwari 7, kuma duk lokacin da ya fesa lambun sai ya rage yawan kwari zuwa kashi 80% na abin da ya kasance a baya. Idan lambun yana da kwari 400 don farawa, kuma Bill ya fesa sau ɗaya kuma ya gabatar da gizo-gizo 12, nawa kwari suka rage? 