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Bunuel
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Bunuel
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This deposits Regina make follow arithmetic progression: 30, 33, 36, 39,.....
For a sequence with equal spacing the sum = mean * # of terms
# of terms = (last term - first term)/spacing + 1 = (90-30)/3 + 1 = 21. this is the week Regina deposits $90.
mean = (first term + last term)/2 = (30+90)/2 = 60
Sum = 21*60 = 1260
Regina started with $100, total = 1260+100 = $1360.
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