to calculate

https://tts.langeek.co/read?text=dG8gY2FsY3VsYXRl&hash=b9d51cc014c82ca06af2ec78f432ecc42507d015&lang=en&cache-only=0&driver=googletts&accent=US

Here you will find the vocabulary from Unit 10 in the Headway Intermediate coursebook, such as "fall out", "develop", "save up", etc.