Give the kid a break he is new to investing. He will figure it out but the basic math is as follows:
If:
DROP has 200,000,000 shares and the do a 20 for 1 reverse split they would then hae 10M shares. If the price was .20c when that happens it would be $4 per share post split.
If you have 10K shares when the split happens you would then have 500 shares. 10,000 / 20 = 500. Your value of the shares pre split would be 10K x .20c = $2,000. and post split would be 500 shares x $4 = $2,000. the same value. I hope this helps.