Reuters

LOS ANGELES

“Transformers: Age of Extinction,” the fourth in the series of films about form-changing Autobot robots that save the planet, powered up with $100 million in box office sales, jump-starting a sleepy summer with the year’s biggest opening weekend. “22 Jump Street,” starring Channing Tatum and Jonah Hill, was second with $15.4 million in its third week in theaters, according to studio estimates. Animated film “How to Train Your Dragon 2” took the No. 3 spot with sales of $13.1 million for the Friday through Sunday period at US and Canadian theaters. “Transformers: Age of Extinction” stars Mark Wahlberg in his first outing taking on the evil Dinobots.