Answer:
price of good  = $89.6
Explanation:
given data
time t = 7 day
cost at the beginning = $0.7
solution
when here prices doubled each day
so that after t day the price of good will be = pĂ—[tex]2^{t}[/tex] Â ....................1
put her value
price of good  = $0.7 Ă— [tex]2^{7}[/tex] Â
price of good  = $89.6