# Function to calculate energy cost for a given age

def calculate$\_$child$\_$cost$($age$)$:

if age $<=4$:

return $0\mathrm{.}5$

elif $5<=$ age $<=9$:

return $0\mathrm{.}6$

elif $10<=$ age $<=13$:

return $0\mathrm{.}7$

elif $14<=$ age $<=17$:

return $0\mathrm{.}8$

else:

return $1\mathrm{.}0$ # Full price for adults

# Function to calculate energy cost based on inputs

def calculate$\_$energy$\_$cost$($residents$,$ children, tier$)$:

base$\_$price$\_$per$\_$week $=15\mathrm{.}0$

partner$\_$discount $=0\mathrm{.}05$

tier$\_$discounts $=\{\text{'}$B$\text{'}$: $0\mathrm{.}0,\text{'}$S$\text{'}$: $0\mathrm{.}10,\text{'}$G$\text{'}$: $0\mathrm{.}15\}$

# Calculate base cost

base$\_$cost $=$ base$\_$price$\_$per$\_$week $*$ residents

# Apply tier discount

base$\_$cost $-=$ base$\_$cost $*$ tier$\_$discounts$[$tier$]$

# Apply partner discount if there are two residents

if residents $==2$:

base$\_$cost $*=(1-$ partner$\_$discount$)$

# Calculate children's energy cost

children$\_$cost $=$ sum$($calculate$\_$child$\_$cost$($age$)$ for age in children$)$

# Calculate total cost

total$\_$cost$\_$per$\_$week $=$ base$\_$cost $+($children$\_$cost$*$base$\_$cost$)$

# Convert to monthly and annual costs

total$\_$cost$\_$per$\_$month $=$ total$\_$cost$\_$per$\_$week $*4\mathrm{.}34524$ # Average number of weeks in a month

total$\_$cost$\_$per$\_$year $=$ total$\_$cost$\_$per$\_$week $*52\mathrm{.}143$

return total$\_$cost$\_$per$\_$week, total$\_$cost$\_$per$\_$month, total$\_$cost$\_$per$\_$year

# Function to get user input and generate energy cost quote

def generate$\_$quote$()$:

print$("--------------------------------")$

print$("$Welcome to SmartEco Energy Solutions"$)$

print$("--------------------------------")$

print$("$Let us help you manage your energy usage."$)$

while True:

residents $=$ int$($input$("$Enter the number of residents $(1-2)$: $"))$

if residents $<1$ or residents $>2$:

print$("$Please enter a valid number of residents."$)$

continue

children $=[]$

num$\_$children $=$ int$($input$("$Enter the number of children $(0+)$: $"))$

for i in range$($num$\_$children$)$:

age $=$ int$($input$($f$"$Enter the age of child $\{$i $+1\}$: $"))$

children.append$($age$)$

while True:

tier $=$ input$("$What tier of energy plan would you like?

$[$B$]$asic$/[$S$]$ilver$/[$G$]$old: $").$upper$()$

if tier not in $[\text{'}$B$\text{'},\text{'}$S$\text{'},\text{'}$G$\text{'}]$:

print$("$Please enter a valid tier."$)$

continue

else:

break # Break out of the tier input loop if a valid tier is entered

weekly$\_$cost$,$ monthly$\_$cost$,$ annual$\_$cost $=$ calculate$\_$energy$\_$cost$($residents$,$ children, tier$)$

print$("$

Thank you. Your monthly energy cost is:$")$

print$($f$"$$ $\{$weekly$\_$cost:$\mathrm{.}2$f$\}$ per week"$)$

print$($f$"$$ $\{$monthly$\_$cost:$\mathrm{.}2$f$\}$ per month"$)$

print$($f$"$$ $\{$annual$\_$cost:$\mathrm{.}2$f$\}$ per annum

$")$

another$\_$quote $=$ input$("$Do you need another quote $($y$/$n$)?").$lower$()$

if another$\_$quote $!=\text{'}$y$\text{'}$:

print$("$Have a sustainable day."$)$

break

# Main function

if $\_\_$name$\_\_=="\_\_$main$\_\_"$:

generate$\_$quote$()$

Draw a flow chart based on the above python program