What is 150 percent of 70 dollars

What does this saying mean: "我舍友说每次看咱俩视频 他们的心灵都会受到一万点的暴击伤害". i was watching a film where 2 characters were video calling each other and one of them said this. google translate couldn't . a lot in advanced.

The children built a sand castle near the water.

Why does the author interrupt louie’s narrative with information about japan and germany?