A certain large forest ecosystem forms and releases its products into the biosphere in the form of biomass during the year.

A certain large forest ecosystem forms and releases its products into the biosphere in the form of biomass during the year. 93% of this production is consumed by the living population of the ecosystem. The rest of the biomass – about 12 million tons – is accumulated in the form of deposits. How much biomass does this ecosystem produce per year?

100% -93% = 7%
12million t = 7%
X million tons – 100%
12×100 / 7 = 171.4 million tons of biomass

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