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Goku: 300万
Super Saiyan Goku: 1億5000万
Freeza 50%: 6000万
Freeza 100%: 1 億2000万
“万” (man) is the kanji for 10 thousand, while “億” (oku) represents 100 million. If you do the math, “300 man” is 3 million and “1 oku, 5 thousand man” is 150 million. It is easy to see how someone not too experienced with the Japanese number system could make a mistake converting them, especially since all the previous battle powers in this section of Daizenshuu 7 are written purely in Arabic numerals, with no kanji or mathematical conversion required.
What about the change in Goku’s battle power after that?
Even after the battle with Freeza, formidable enemies surpassing human knowledge appeared one after the other to face Goku. Though the power-ups received after having wounds healed became small, Goku and co. began using transformations and fusions to increase their battle powers, to the point where they could no longer be measured numerically…
KidTrunks would have to be born with an extremely high Base PowerLevel, & or gain enough from Namek Base Goku's 3Million to 120Million in his Base form just to rival Frieza.
Than have to gain enough to rival Android18.
A Base KidTrunks with a PowerLevel that high would be 6.000.000.000 as a SuperSaiyan.
If Goku & Vegeta's PowerLevel in Base never got high enough to rival Frieza, then how could any Fusion between them surpass a SuperSaiyan3 Gotenks.