Old School RuneScape math

from math import ceil, floor

def roll(stat, level, potion_base=0, potion_procent=0, prayer=0, style_bonus=False):
    e = ceil((level+potion_base+floor(level*potion_procent/100))*(1+(prayer/100)))+8 + style_bonus*3
    b = stat
    return e * (b + 64)

def rate(attack, defence):
    if attack < defence:
        return attack/(2*(defence+1))
    return 1-(defence+2)/(2*(attack+1))

def strength(stat, level, potion_base=0, potion_procent=0, prayer=0, style=False):
    effective = (level+potion_base+floor(level*potion_procent/100))*(1+(prayer/100)) + style*3
    bonus = stat
    return int(1.3+effective/10+bonus/80+effective*bonus/640)

def display(r):
    return f'{int(r*1000)/10}%'
    
def dps(attack, strength, defence):
    return rate(attack, defence)*(1+strength)/2/2.4
    
hakkeAtt = roll(173, 99, 5, 15, 15, True)
hakkeDef = roll(300, 70, 5, 15, 15)
hakkeStr = strength(119, 50, 5, 15, 15)

chadAtt = roll(161, 99, 5, 15, 20)
chadDef = roll(269, 99, 5, 15, 25)
chadStr = strength(154, 99, 5, 15, 23, True)

iblisAtt = roll(117, 51, 5, 15, 15)
iblisStr = strength(76, 99, 5, 15, 18, True)
olmDef = roll(200, 150)

print('Iblis träffar olm med', display(rate(iblisAtt, olmDef)))


iblis_dps_olm = dps(iblisAtt, iblisStr, olmDef)
hakke_dps_olm = dps(hakkeAtt, hakkeStr, olmDef)
hakke_dps_chad = dps(hakkeAtt, hakkeStr, chadDef)
chad_dps_hakke = dps(chadAtt, chadStr, hakkeDef)
chad_dps_olm = dps(chadAtt, chadStr, olmDef)
print('Iblis dps vs. olm', iblis_dps_olm*100//1/100)
print('Hakke dps vs. olm', hakke_dps_olm*100//1/100)
print('Hakke dps vs. chad', hakke_dps_chad*100//1/100)
print('Chad dps vs. hakke', chad_dps_hakke*100//1/100)
print('Chad dps vs. olm', chad_dps_olm*100//1/100)

print('Hakke träffar', display(rate(hakkeAtt, chadDef)))
print('Chad träffar', display(rate(chadAtt, hakkeDef)))

print('Hakke skadar max', hakkeStr)
print('Chad skadar max', chadStr)