Multiply:

/*r4 = base exp..*/
/*r5 = foe’s level*/
/*This multiplies the base exp. by the opponent’s level*/
/*Then it multiplies the result by 20*/
/*Then it divides the whole thing by 100*/
/*This is the same as dividing it by 5*/
/*r0 is the top number, r1 is the bottom number*/

mul r4, r5
mov r1, r4 /*r1 is B x L*/
mov r0, #0x14
mul r0, r1 /*r0 = B x L*/
mov r1, #0xFA /*r1 = 100*/
bl Divide /*divides by 100*/
mov r3, r0

LevelStuff:

/*This multiplies the foe’s level by 2*/
/*Then adds 10 to the result*/
/*Then it multiplies that result by itself to square it*/
/*This is the top part of the level ratio*/

mov r2, #0x2
mov r1, r5 /*move foe level to r1*/
mul r1, r2 /*multiply foe level by 2*/
mov r2, #0xA
add r1, r1, r2 /*add 10 to 2 x Foe Level*/
mul r1, r1 /*multiply (2L+10) by itself*/

BottomLevel:

/*r5 = foe’s level*/
/*r6 = your level*/
/*This add your level to the opponent’s level*/
/*Then adds ten to that sum*/
/*multiplies by itself to square it*/

add r5, r5, r6
add r5, r5, r2
mul r5, r5

DivideAgain:

/*r1 = (2L+10)^2*/
/*r5 = (L+Lp+10)^2*/
/*r6 = (B x L) / 5*/
/*Stores answer to r0*/
/*Then moves answer to r2*/

mov r0, r1
mov r1, r5
mov r6, r3 /*move BL/5 to r6*/
mov r3, #0x64 /*multiply top by 100*/
mul r0, r3
bl Divide /*Divide top by bottom*/
mov r2, r0

DivideSomeMore:

/*r6 = BL/5*/
/*r2 = Level Ratio*/
/*Multiplies the 2nd term by 100*/
/*Then divides whole thing by 100*/

mul r6, r2 /*multiply BL/5 by (100*2ndTerm)*/
mov r0, r6
mov r1, #0xFA
bl Divide /*Divides (BL/5)*(100*2ndTerm) by 100*/