First, when multiplying percents, you need to convert them to decimals. You convert percents to decimals by multiplying by 100 or moving the decimal two places to the left. Once you convert them to full decimals, you multiply the decimal by the number that you are getting the percentage from
61% of 180β.61Γ180=109.8
5.1% of 81?β.051Γ81=4.131
of 36?β16.5Γ36β.165Γ36=5.94
81% of 241β.81Γ241=195.21
76% of 600β.76Γ600=456
88% of 680β.88Γ680=598.4
37% of 481β.37Γ481=177.97
19.1% of 380β.191Γ380=72.58
41% of 321β.41Γ321=131.61
33% of 331β.33Γ331=109.23