Jimmy spent 3 * $1 = $<<3*1=3>>3 on pens.
He spent 4 * $3 = $<<4*3=12>>12 on notebooks.
He spent 2 * $5 = $<<2*5=10>>10 on folders.
He spent $3 + $12 + $10 = $<<3+12+10=25>>25 in total.
His change will be $50 - $25 = $<<50-25=25>>25.
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