a) total percentage change is given by
formula(a+b+ab/100)
percentage changes given by
for store P ,
16-7-16*7/100= 7.88
for store Q ,
=13-7-13*7/100= 5.09
for store R ,
18-7-18*7/100= 9.74
for store S ,
12-5-60/100= 6.4
for store T
,15-5-75/100= 9.25
so, store R is answer
b) percentage increase for store R is
for store R 18-7-18*7/100= 9.74
so, dollar amount of sales for 1979 was 109.74 % of dollar amount
of sales for 1977
option e) is answer
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