Answer:
a)x₁  = 24  business owners plan to provide a gift this year
b)  p-value = 0,0017
c)p-value < α   we have to eject H₀   And support the claim that the proportion of business owners providing gifts has decrease
Step-by-step explanation:
a) Sample size 80
 proportion  p₁  = 30 %   p₁ = 0,3
Then   x₁ = 80*0,3
x₁  = 24  business owners plan to provide a gift this year
b) Hypothesis Test
Null Hypothesis                    H₀          p₁  =  0,45
Alternative Hypothesis        Hₐ          p₁  <  0,45
p₁  =  0,3   then  q₁  =  1  -  0,3    q₁ =  0,7
z(s)  = ( p₁  -  0,45 )/ √p₁* q₁ / n
z(s)  =  -  0,15 / √0,002625
z(s) = - 0,15 / 0,05123
z(s) = - 2,9279
b)From z-table we find  p-value = 0,0017
c) If  α = 0,05   ( significance level )  as 
p-value < α   we have to eject H₀   And support the claim that the proportion of business owners providing gifts has decrease