exam Maths Puzzle Numerical Ability

complex fractions

4 + 2 over x over x over 4+ 1 over 8

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exam Other Question

Hello,

I need help with this problem:

Li Teng is ordering graduation announcements for the senior class. If 100 announcements are ordered, the cost is $255. The cost for I dont understand how to do Unit Rate at all. Could someone help me on giving me step by step instructions how to?