Answer:
201
Explanation:
74 for july
+
74-8=66 for august
66-5=61 for september
= 201
201 mobile phones
July: 74 mobile phones
August: 74 - 8 = 66 mobile phones
September: 66 - 5 = 61 mobile phones
74 + 66 + 61 = 201 mobile phones
Hope this helps!
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