My code is showing error for test case 5. My attempt in comment section.

Question

You are getting ready to paint a piece of art. The canvas and brushes that you want to use will cost 40.00. Each color of paint that you buy is an additional 5.00. Determine how much money you will need based on the number of colors that you want to buy if tax at this store is 10%.

Task
Given the total number of colors of paint that you need, calculate and output the total cost of your project rounded up to the nearest whole number.

Input Format
An integer that represents the number of colors that you want to purchase for your project.

Output Format
A number that represents the cost of your purchase rounded up to the nearest whole number.

Sample Input
10

Sample Output
99

Answer 1

//Mahak Add this
int d = round(p);
cout<<d;

Answer 2

#include <iostream>
#include <cmath>
using namespace std;

int main()
{
float n;
cin>>n;
float c = n*5.00 ;
float p = c + 0.1*(c + 40.00) + 40.00;
cout<<round(p);
return 0;
}

thanks for reminding Simba

Answer 3

Thank you Lisa Simba
It's done.

Answer 4

Is you output after rounding up still a float? According to the task description an integer is required...