Stock worth $80 a share dropped in value by 15% on tuesday, then increased by $7 the next wednesday and, finally, increased by 12% on thursday. what was the final price of a share?

So here are a couple expressions when a value changes by percentage (p = percentage in decimal form and m = original value):

So firstly, the $80 share dropped by 15%. Since this is a decrease, follow the appropriate expression:

On Tuesday, the share went from $80 to $68

Next, on Wednesday the share increased by $7. With this, just add $68 and 7.

On Wednesday, the share went from $68 to $75

Lastly, on Thursday the share increased by 12%. Since this is an increase, follow the appropriate expression:

The final price of the share is $84.

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