Code Example $5-1$

$1.$ count $=1$

$2.$ item$\_$total $=0$

$3.$ item $=0$

$4.$ while count $<4$:

$5.$ item $=$ int$($input$("$Enter item cost: $"))$

$6.$ item$\_$total $+=$ item

$7.$ count $+=1$

$8.$ average$\_$cost $=$ round$($item$\_$total $/$ count$)$

$9.$ print$($f$"$Total cost: $\{$item$\_$total$\}$

Average cost: $\{$average$\_$cost$\}")$

Refer to Code Example $5-1$: If the user enters $5,10,$ and $15$ at the prompts, the output is:

Total cost: $30$

Average cost: $8$

Which line should be changed to fix this logic error?