Answer:
a) x=25+0.06y
b)x=25+0.06*30=£26.80
c)x=25+0.06*200=£37
d)x=25+0.06y ; 43=25+0.06y ; 43-25=0.06y ; 18=0.06y ; y=18÷0.06 ; y=300 messages
Explanation:
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