Make 3 tasks on a subject: decimal fractions. Quicker please)) Tasks not from the Internet, and)

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1. Mom bought in shop of 3 different packs of croutons and a package. The first pack costs 13.4 rubles, the second — 22.6 rubles, the third — 18.9 rubles. How much is a package if generally 57.1 rubles 2 were spent for purchase. Yesterday dollar exchange rate in relation to ruble was 61.3 rubles. Today it makes 62.2 rubles. By how many this course 3 increased. Masha spoke by phone with the girlfriend. How many money at her left on a conversation if 1 minute costs 0.89 rubles, and Masha talked half an hour
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Answer add