、？
Huh? Hundreds of thousands of yen for the betrothal gifts?!
Literal
Eh, betrothal-gifts [for-に] X-hundred-thousand yen?
結納 is the traditional Japanese betrothal ritual where the groom's family presents formal gifts (結納品) to the bride's family — the figure often runs into the hundreds of thousands or millions of yen. The ン十万 uses the katakana character ン as an unspecified-digit placeholder — literally '[some digit]-ty ten-thousand' = 'some X-hundred-thousand.' A stylized Japanese convention for 'an amount in the hundred-thousands, exact figure elided.' The bare-noun-question form with え reaction expresses sticker shock.