=IF(B7=50000000,$B24*$D24+$B25*$D25+((B7-$D26)*$B26),IF(COUNTIF(B7,"b7$D24,b7$D26"),$B24* 40000000+((B7-40000000)*$B25),IF(B740000000,$B24*B7,0)))

The issue I'm having with this formula is the greater than x but less than y
if statement. For some reason it won't recognize it. I tried the countif
formula, but no luck. Anyone know how to fix this?