我应该对 output 进行哪些更改以显示两位小数？

Question

I want my output to have a 2 decimal places result. What should I do? Ideal output is:

Enter the number of plants to purchase: 14

Enter the price per unit of plant: 250.00

The total payable amount is: P3,350.00

 n1 = input('Enter number of plants: ')
    n2= input('Enter price per unit: ')
    
    mul= float(n1) * float(n2)
    mul2= (float(n1)-float(10)) * (float(n2))
    mul3 = float(10) * float(n2)
    
    discount2 = float (mul2)* float(0.15)
    
    total2=mul2-discount2
    total3= total2+mul3
    
    
    
    if float(n1)<=float(10):
        mul= float(n1) * float(n2)
        print('The total payable amount is: ', mul)
     
    
    
    elif float(n1)>float(10):
        print('The total payable amount is: ', total3)

Answer 1

You can use the str.format function and I made some small adjustments to your code.

n1 = float(input('Enter number of plants: '))
n2= float(input('Enter price per unit: '))

mul = n1 * n2

if n1<=10:
    print('The total payable amount is: {:.02f}'.format(mul))
else:
    print('The total payable amount is: {:.02f}'.format(0.85*mul+1.5*n2))

Answer 2

A few answers missed the fact you also needed thousands separated by a comma. here is the format command which displays the price the way you expect it

n1 = input('Enter number of plants: ')
n2= input('Enter price per unit: ')

mul= float(n1) * float(n2)
mul2= (float(n1)-float(10)) * (float(n2))
mul3 = float(10) * float(n2)

discount2 = float (mul2)* float(0.15)

total2=mul2-discount2
total3= total2+mul3



if float(n1)<=float(10):
    mul= float(n1) * float(n2)
    print('The total payable amount is: ${:0,.2f}'.format(mul))
    
    
    
elif float(n1)>float(10):
    print('The total payable amount is: ${:0,.2f}'.format(total3))

Answer 3

Use a formatted string . Also, convert the values to floats at the start, then there is no need to keep converting everything.

plants_str = input('Enter number of plants: ')
price_str = input('Enter price per unit: ')
plants = float(plants_str)
price = float(price_str)
total = plants * price
if plants > 10:
    total -= 0.15 * (plants - 10) * price
print(f"The total payable amount is: {total:0,.2f}")

But as noted in a comment, for serious applications involving currency you should use the decimal library. This ensures decimal numbers are represented exactly.

from decimal import Decimal
plants_str = input('Enter number of plants: ')
price_str = input('Enter price per unit: ')
plants = Decimal(plants_str)
price = Decimal(price_str)
total = plants * price
if plants > 10:
    total -= Decimal("0.15") * (plants - 10) * price
print(f"The total payable amount is: {total:0,.2f}")