$19\mathrm{.}3$ LAB$*$: Program: Painting a wall

LABACTIVITY

$19\mathrm{.}3\mathrm{.}1$: LAB$*$: Program: Painting a wall

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Program Specifications Write a program to calculate the cost to paint a wall. Amount of required paint is based on the wall area. Total cost includes paint and sales tax.

Note: This program is designed for incremental development. Complete each step and submit for grading before starting the next step. Only a portion of tests pass after each step but confirm progress.

Step $1(2$ pts$).$ Read from input wall height, wall width, and cost of one paint can $($floats$).$ Calculate and output the wall's area to one decimal place using print$($f$"$Wall area: $\{$wall$\_$area:$\mathrm{.}1$f$\}$ sq ft$")$;$.$ Submit for grading to confirm $1$ test passes.

Ex: If the input is:

$12\mathrm{.}015\mathrm{.}029\mathrm{.}95$

the output is:

Wall area: $180\mathrm{.}0$ sq ft

Step $2(2$ pts$).$ Calculate and output the amount of paint needed to three decimal places. One gallon of paint covers $350$ square feet. Submit for grading to confirm $2$ tests pass.

Ex: If the input is:

$12\mathrm{.}015\mathrm{.}029\mathrm{.}95$

the output is:

Wall area: $180\mathrm{.}0$ sq ft Paint needed: $0\mathrm{.}514$ gallons

Step $3(2$ pts$).$ Calculate and output the number of $1$ gallon cans needed to paint the wall. Extra paint may be left over. Hint: Use ceil$()$ from the math module to round up to the nearest gallon $($int$).$ Submit for grading to confirm $4$ tests pass.

Ex: If the input is:

$12\mathrm{.}015\mathrm{.}029\mathrm{.}95$

the output is:

Wall area: $180\mathrm{.}0$ sq ft Paint needed: $0\mathrm{.}514$ gallons Cans needed: $1$ can$($s$)$

Step $4(4$ pts$).$ Calculate and output the paint cost, sales tax of $7\%,$ and total cost. Dollar values are output with two decimal places. Submit for grading to confirm all tests pass.

Ex: If the input is:

$8\mathrm{.}08\mathrm{.}049\mathrm{.}20$

the output is:

Wall area: $64\mathrm{.}0$ sq ft Paint needed: $0\mathrm{.}183$ gallons Cans needed: $1$ can$($s$)$ Paint cost: $$49\mathrm{.}20$ Sales tax: $$3\mathrm{.}44$ Total cost: $$52\mathrm{.}64$

Here is my code:

import math

# Step $1$

wall$\_$height, wall$\_$width, paint$\_$can$\_$cost $=$ map$($float$,$ input$().$split$())$

wall$\_$area $=$ wall$\_$height $*$ wall$\_$width

print$($f$"$Wall area: $\{$wall$\_$area:$\mathrm{.}1$f$\}$ sq ft$")$

# Step $2$

paint$\_$needed $=$ wall$\_$area $/350$

print$($f$"$Paint needed: $\{$paint$\_$needed:$\mathrm{.}3$f$\}$ gallons"$)$

# Step $3$

cans$\_$needed $=$ math.ceil$($paint$\_$needed$)$

print$($f$"$Cans needed: $\{$cans$\_$needed$\}$ can$($s$)")$

# Step $4$

paint$\_$cost $=$ paint$\_$can$\_$cost $*$ cans$\_$needed

sales$\_$tax $=0\mathrm{.}07*$ paint$\_$cost

total$\_$cost $=$ paint$\_$cost $+$ sales$\_$tax

print$($f$"$Paint cost: $$\{$paint$\_$cost:$\mathrm{.}2$f$\}$ Sales tax: $$\{$sales$\_$tax:$\mathrm{.}2$f$\}$ Total cost: $$\{$total$\_$cost:$\mathrm{.}2$f$\}")$

Here is my error:

Traceback $($most recent call last$)$:

File $"/$usercode$/$agpyrunner$.$py$",$ line $54,$ in

exec$($open$($filename$).$read$())$

File $"",$ line $25,$ in

NameError: name 'total$\_$cost$\text{'}$ is not defined