I need a little help with the following problem.

Student A is attending a study course for 12 weeks in total.

He has just finished 10 of the 12 weeks.

His attendance after 10 weeks is at 70%.

If he goes to all his classes for the remaining 2 weeks, what will his attendance be at the end of the course?

I'm unsure how to calculate this.

Thanks!

Punky.